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nC2 = n(n-1)/2
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Why does nC2=n(n-1)/2? #math
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nC2 = n(n-1)/2
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Prove that 1/2 nC1 -1/3 nC2 + 1/4 nC3 -1/5 nC4 + - - - + (-1)^(n-1)/(n + 1) nCn = n/(n + 1)
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If m=nC2, then prove that mC2=3×(n+1)C4
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Counting 2 ways Show n^2C2 = n nC2 + n^2 nC2 = (n+n^2) nC2 combination
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nC2*0.4^2*(1-0.4)^(n-2) #maths #shorts
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1 - nC2 + nC4 - nC6 + - - - = 2^(n/2) cos(nπ/4) n ≥ 1
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Prove that nC0 + nC2 + nC4 + nC6 + - - - = nC1 + nC3 + nc5 + nC7 + - - - = 2^(n - 1)