Question

if nca=ncb find n



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Answer 1

Step-by-step explanation:

Given If nca=ncb find n

• Given n C a = n C b
• We can write this as
• So n! / (n – a)! a! = n! / (n – b)! b!
• So we get
•  (n – a)! a! = (n – b)!.b!
• Comparing both sides of equation we get
• (n – a) = n – b
• Or n – a = b
• Or n = a + b and also a = b

Therefore n = a + b

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