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If the coefficients of r^(th) , (r+1)^(...

If the coefficients of `r^(th) , (r+1)^(t h)` and ` (r+2)^(th )` terms in the expansion of `(1+x)^(14)` are in A.P, then the value of r is

A

5,9

B

6,9

C

7,9

D

8,9

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The correct Answer is:
A
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HIMALAYA PUBLICATION-BINOMIAL THEOREM-QUESTION BANK
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