Question

For what value of k will k+9,2k-1,and2k+7 are consecutive terms of an ap?

Answer 1

if given terms are in AP then there common difference will be same...


A2-A1=A3-A2

2k-1-k-9=2k+7-2k+1

k-10=8

k=18

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Answer 2

(2k-1)-(k+9)=(2k+7)-(2k-1)
k-10=8
k=18
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