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There is no symbol between a and b.
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It isnC0*A^n*b^0 + nC1*A^(n-1)*b^1 + ... + nCr*A^(n-r)*b^r + ... + nCn*A^0*b^n where nCr = n!/[r!*(n-r)!]
I assume that with n(...) you mean the size of the set. It sure can; but it need not be.
1. With boolean algebra, 1 + n is always equal to 1, no matter what the value of n is.
n plus 15.n plus 15.n plus 15.n plus 15.
4b