Math, asked by khushrajsingh, 9 months ago

7+21/2+14+...+84 find sum AP..

Answers

Answered by amitsnh

2

Answer:

first term = a = 7

common difference = d = 21/2 - 7

= (21-14)/2 = 7/2

tn = 84

a+(n-1)d = tn

7 + (n-1)7/2 = 84

(n-1)*7/2 = 84-7 = 77

n-1 = 77*2/7 = 22

n = 22+1 = 23

Sum = n/2(a+tn)

= 23/2(7+84)

= 23/2*91

= 2093/2

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