Question

if the sum of first nth term ap is 30,27,24 is....120 find numbers of term and last term​

Answer 1

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Answer 2

the last term is 120 that is An is last term

and

to find no of terms we can use

An =a +(n-1)d

We know An

and d is 27-30= -3

and a is 27

so

120=27+(n-1)-3

120-27=(n-1)-3

93=(n-1)-3

93/-3=(n-1)

-31=n-1

-31+1=n

n=30

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