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If 50c r = 50c r + 2 find r.

Correct Answer: 24

Explanation:

By formula, ncx = ncy
⇔ x = y or x + y = n
Now, 50cr = 50cr + 2
⇒ r + r + 2 = 50 or r = r + 2
⇒ 2r = 48 [∵ r = r + 2 is not possible]
∴ r = 24


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