Math, asked by khirodkumarpand9914, 1 year ago

In an ap the first term is 22, n th term is - 11 and the sum of first n terms is 66. Find n and d common difference

Answers

Answered by amarie

4

a=22
an=(-11)
Sn=66
Sn=n÷2(a+an)
66=n÷2(22-11)
66=n÷2(11)
n÷2=6
n=12

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