Question

what is 4th term from the end of AP -11,-8,-5......49.​

Answer 1

Answer:

Step-by-step explanation:

Whenever you need to find nth term from then then you consider last term as the first term istead of first term. For example: Series is : 2,8 ...

Answer 2

Solution :

AP : - 11 , - 8 ,- 5 .....49

Last term = 49

First term (a ) = -11

common difference = -8-(-11) = -8 + 11 = 3

Firstly we Will find the number of terms

›› 49 = -11 + (n - 1)3

›› 49 + 11 = (n - 1)3

›› 60/3 = n - 1

›› 20 + 1 = n

›› n = 21

So, The Given AP has 21 terms

4th term from the Last is 18th term

18th term = a + 17d

›› 18th term = -11 + 17 × 3

›› 18th term = -11 +51

›› 18th term = 40

Hence

• 4th term from the last is 40

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