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Question

nr = 1nCr is 


A
2n
loader
B
2n + 1
loader
C
2n - 1
loader
D
2n1
loader

Solution

The correct option is C 2n - 1
nr = 0nCr  = nC0  + nC1   +nC2                        + ... + nCn  = 2nnr = 1nCr  =  nC1   +nC2                          + ... + nCn  Add and subtract nC0   on RHSnr = 1nCr  = nC0  + nC1   +nC2                        + ... + nCn    nC0                  = 2n  1

Mathematics

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