Question

Find tha number of terms of tha ap are -12, -9,-6,....21 if 1 is added to each term of tha ap

Answer 1

If we add any number in each term of the A.P. then number of term will not change.

Here, a=-12 ,d=3 , last term=21

we know that nth term of an

A.P. is given by Tn=a+d(n-1)

implies 21=-12+(n-1)×3

33= (n-1)×3

( n-1)=11

n=12.

Answer 2

Answer:

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