1
IIT-JEE 1979
MCQ (Single Correct Answer)
+2
-0.5
$${}^n{C_{r - 1}} = 36,{}^n{C_r} = 84\,\,and\,\,{}^n{C_{r + 1}} = 126$$, then r is :
Questions Asked from Permutations and Combinations (MCQ (Single Correct Answer))
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