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Question

Question: Value of <sup>4</sup>C<sub>3</sub> + <sup>5</sup>C<sub>3</sub> + <sup>6</sup>C<sub>3</sub> ....... +...

Value of 4C3 + 5C3 + 6C3 ....... + 11C3 + 12C3 equal to

A

13C4 –1

B

13C4

C

13C4 + 1

D

12C4 – 1

Answer

13C4 –1

Explanation

Solution

Use nCr + nCr–1 = n+1Cr add subtract. 4C4