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21. If nC(r-1) = 36 and nCr = 84 and nC(r+1) = 126 then value of r is : (A)9 (B)3 (C)4 (D)5 (E)6 |
| Answer» 21. If nC(r-1) = 36 and nCr = 84 and nC(r+1) = 126 then value of r is : (A)9 (B)3 (C)4 (D)5 (E)6 | |