- #1

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nCr formula: n!/r!(n-r)!

I've tried everything I can but I don't know how to approach this question.

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- Thread starter karspider
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- #1

- 1

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nCr formula: n!/r!(n-r)!

I've tried everything I can but I don't know how to approach this question.

- #2

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You might try (x + y)^1 show that the coefficients are 1 and 1; and then assume it's true for (x+y)^n and show if that is true then it works for the row (x + y) ^(n+1).

I haven't tried that; but it would be my first try.

- #3

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