1.

If `""^(n)C_(r -1) = 36, ""^(n)C_(r) = 84 " and " ""^(n)C_(r +1) = 126`, then find the value of `""^(r)C_(2)`.A. (8,4)B. (9,3)C. (7,5)D. (6,5)

Answer» Correct Answer - B


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