Question

(11)
If 15C3r = 15Cp+3, then r is equal to:​

Answer 1

Answer:

If 15C3r = 15Cr+ 3 , then we follow the formula: Cx = nCy where x = y OR x + y = n. r cannot be a fraction since this will give us 1.5 therefore the answer will be r = 3.

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