JEE Advance - Mathematics (1979 - No. 17) | ExamPlay

JEE Advance - Mathematics (1979 - No. 17)

$${}^n{C_{r - 1}} = 36,{}^n{C_r} = 84\,\,and\,\,{}^n{C_{r + 1}} = 126$$, then r is :

1

2

3

None of these.

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