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Question

Find the value of a6−1a3 given that a2−1a=2


A
10
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B
6
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C
14
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D
21
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Solution

The correct option is C 14

(a21)3=a63a4+3a21
=(a61)+3a2(1a2)
a61a3+3(1a2)a=8
a61a3=14


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