if 15,k-1,-1 are in ap find k
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5
the value of k is 8
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if 15,k-1,-1 are in ap
Then
15 - ( k-1) = k-1-(-1) .... [common difference between the terms ]
=> 15 -k +1 = k-1+1
=> 16 -k = k
=> 2k = 16
=> k = 8
Then
15 - ( k-1) = k-1-(-1) .... [common difference between the terms ]
=> 15 -k +1 = k-1+1
=> 16 -k = k
=> 2k = 16
=> k = 8
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