Math, asked by kachharahansal, 10 months ago

The first term of an AP is 35 and the last of 15 terms is -109 find the sum of this term

Answers

Answered by saharounak093

1

Answer:

Step-by-step explanation:a=35

l=-109

By the sum of A.P. formula,

Sn=n/2{a+l}

Here n=15

Sn=15/2(35-109)

Sn=15/2×-74

Sn=-555

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