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If (1+x) ^(15) =a(0) +a(1) x +a(2) x ^(2...

If `(1+x) ^(15) =a_(0) +a_(1) x +a_(2) x ^(2) +…+ a_(15) x ^(15),` then the value of `sum_(r=1) ^(15) r . (a_(r))/(a _(r-1))` is-

A

110

B

120

C

115

D

135

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The correct Answer is:
B
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