Question

find the number of terms in an ap 12,15 ,18,.......99​

Answer 1

Answer:

The number of terms in the given A.P 12,15 ,18,.......99​ are 30.

Step-by-step explanation:

We know the formula for finding the last term of an A.P as

l=a+(n-1)d

Where,l=Last term,a=First term,n=No.of terms,d=Common differnce

Given,l=99,a=12,

d=a2-a1=15-12=3

To find:

No.of terms(n)

99=12+(n-1)3

87=(n-1)3

n-1=29

n=30.

Hope this helps you..

Answer 2

Answer:

The above answer is right

Step-by-step explanation:

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