Asked by Same
How do I show that
Sum r=0 to n (-1)^r ncr=0??
Please how have tried and tried?
Sum r=0 to n (-1)^r ncr=0??
Please how have tried and tried?
Answers
Answered by
oobleck
you can start with
nCr = nC(n-r)
the elements of the row are symmetric about the center.
And the are opposite in sign.
nCr = nC(n-r)
the elements of the row are symmetric about the center.
And the are opposite in sign.
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