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Question

Let S1 = nC0 + nC1 + nC2.............nCn and S2 = nC0 - nC1 + nC2 ..............+ (1)n nCn

Find the value of S1S1+S2 is ___.

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Solution

Consider the expansion of (1+x)n

(1+x)n = nC0 + nC1x + nC2x2 ...............nCcxn

When we put x = 1, we get S1 and when we put x = -1, we get S2

S1 = nC0 + nC1 + nC2 ........nCn = 2n

S2 = nC0 - nC1 + nC2 ........= 0

S1S1+S2 = S1S1 = 1


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