Question

If 18cr= 18cr+2, find the value of r

Answer 1

Answer:

18 C r

= 18 C r+2

So, r=r+2 or 18−r=r+2

× = 16=2r

r=8

So,

8 C 5 = 5!3! 8!

= 6×7×8

=56.

Hence, the answer is 56.

Explanation:

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