Question

How to find no of terms when sum of arithmetic sequence is given?

Answer 1

Use formula ;

Sn = n / 2 ( 2a + ( n - 1 ) d )

And

Sn = n / 2 ( a + l )

where, a = first term

d = common difference

n = no of terms

l = last term

Sn = sum of terms.

Put all the values and find out the value of n.

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