Math, asked by sinchanaprabkr, 8 months ago

Which term of 11,13,15. ..... is 89?​

Answers

Answered by Anonymous
2

A.P = 11,13,13,......

a (first term) = 11

d (common difference) = 13-11 = 2

an (last term) = 89

Need to find - n (no. of terms)

We have a formula,

an = a+(n-1)d

89 = 11 + (n-1)2

89-11 = (n-1)2

78 = (n-1)2

n-1 = 78/2

n-1 = 39

n = 39 + 1

n = 40

So 89 is the 40th term of the given A.P

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