Math, asked by vanishasaxena09, 6 months ago

In a AP if the sum of first 16 term is 680
and Common difference 5, find the
first term

Answers

Answered by Anonymous

1

Hey there!

Answer:

S(16) = 680

d = 5

S = n/2{ 2a + (n-1) d}

where n is no of terms

d is common difference

a is first term

680 = 16/2{2a+(16-1)5}

680 = 8 {2a+ 75}

85 = 2a + 75

2a = 10

a = 5

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