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Question

Find the common difference of an A.P. in which a18a14=32.

A
8
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B
8
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C
4
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D
4
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Solution

The correct option is A 8
Let the common difference of an A.P. be d.
Then,
a18=a1+17×d
a14=a1+13×d
Solving the two equations,
a18a14=a1+17da113d
a18a14=4d
Substituting 4d=32,
d=8

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