and I dont understand how he says he needs 18 jumps for the 19th term

This happens because for the first term (4) you don't need a jump. But from the second term onwards you take one more jump each time. So by the time you reach the 19th term, you would only need 18 jumps because you start jumping at the 2nd term.

Why is it (n-1)d and not b or c?

The "d" is supposed to represent the "difference" between each term of the arithmetic sequence. Thus it is denoted by a "d" since the word difference starts with a "d" not a b or c.

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Class 10 (Old)

Course: Class 10 (Old) > Unit 5

Lesson 3: nth term of an AP

Nth term of an arithmetic progression

Name: Nth term of an arithmetic progression
Uploaded: 2018-06-07T16:57:55Z
Description: Let's look at an example problem to learn how to find the nth term of an arithmetic progression. Let's also derive the general expression for the nth term.

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Let's look at an example problem to learn how to find the nth term of an arithmetic progression. Let's also derive the general expression for the nth term. Created by Aanand Srinivas.

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Ilyas10
Posted 4 years ago. Direct link to Ilyas10's post “and I dont understand how...”
and I dont understand how he says he needs 18 jumps for the 19th term
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(1 vote)
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- thedarkpikle
  Posted 3 years ago. Direct link to thedarkpikle's post “This happens because for ...”
  This happens because for the first term (4) you don't need a jump. But from the second term onwards you take one more jump each time. So by the time you reach the 19th term, you would only need 18 jumps because you start jumping at the 2nd term.
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  (5 votes)
Arbaaz Ibrahim
Posted 5 years ago. Direct link to Arbaaz Ibrahim's post “Why is it (n-1)d and not ...”
Why is it (n-1)d and not b or c?
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(0 votes)
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- Maryam Moazzam
  Posted 5 years ago. Direct link to Maryam Moazzam's post “The "d" is supposed to re...”
  The "d" is supposed to represent the "difference" between each term of the arithmetic sequence. Thus it is denoted by a "d" since the word difference starts with a "d" not a b or c.
  Comment on Maryam Moazzam's post “The "d" is supposed to re...”
  (8 votes)
Ilyas10
Posted 4 years ago. Direct link to Ilyas10's post “how did he get to the 19t...”
how did he get to the 19th term I dont understand how he got 58 because he did not multiply and he didn't really explain it
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(1 vote)
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- thedarkpikle
  Posted 3 years ago. Direct link to thedarkpikle's post “Well, 18*3 would be 54, a...”
  Well, 18*3 would be 54, and 54+4 would be 58. Same thing with the 23rd term, 22*3 is 66, and 66+4 is 70.
  
  Hope this helps :)
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  (1 vote)
Ashish Patil
Posted 3 years ago. Direct link to Ashish Patil's post “If we divide sum of any t...”
If we divide sum of any two term of ap then why we got exactly middle term of this two term?
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(1 vote)
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- Mohammed Owais
  Posted 3 years ago. Direct link to Mohammed Owais's post “Its bcoz, (Ref=n/2) the s...”
  Its bcoz, (Ref=n/2) the sum of any 2 terms of an AP is divided by 2 gets it middle number. example, 3+6/2 is 4.5 which is the middle of these terms and if you multiply 4.5x2 then u will get 9!
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  (1 vote)
Micunovic, Marko
Posted 3 years ago. Direct link to Micunovic, Marko's post “what would be nth term fo...”
what would be nth term formula for 4, -9, 16, -25?
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(1 vote)
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Ufo-88
Posted 3 years ago. Direct link to Ufo-88's post “I think there is another ...”
I think there is another method for doing this, is it?
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(1 vote)
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george.malko.student.sundbyberg
Posted 2 years ago. Direct link to george.malko.student.sundbyberg's post “what if the sequence isnt...”
what if the sequence isnt the same through out ?
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(1 vote)
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- Nolan Ryzen Terrence
  Posted 2 years ago. Direct link to Nolan Ryzen Terrence's post “Then it won't be an arith...”
  Then it won't be an arithmetic progression sequence! Simple
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  (1 vote)
Accurateee
Posted 3 years ago. Direct link to Accurateee's post “What is the nth term of t...”
What is the nth term of the following sequence……… 8, 3, -2, -7………..
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(0 votes)
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- thedarkpikle
  Posted 3 years ago. Direct link to thedarkpikle's post “n = 8+(n-1)5”
  n = 8+(n-1)5
  Comment on thedarkpikle's post “n = 8+(n-1)5”
  (2 votes)
Rupa Gcde Roy
Posted 5 years ago. Direct link to Rupa Gcde Roy's post “-1 , 5, 9, 29...... what ...”
-1 , 5, 9, 29...... what is the next term give me detailed about the AP
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Arbaaz Ibrahim
Posted 5 years ago. Direct link to Arbaaz Ibrahim's post “The term that starts of a...”
The term that starts of a sequence, is that counted as the first term, or just a starting point?

In the example 2, 4, 8, 16, we are multiplying by 2 each time but, is 2 the first term in the sequence?
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Class 10 (Old)

Course: Class 10 (Old) > Unit 5

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