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Question Stats:
77% (01:35) correct 23% (01:40) wrong based on 1477 sessions1*2*3*...*(x-1)*
x*(x+1)*(x+2)=(x-1)!*x*(x+1)*(x+2)\). Notice that 1*2*3*...*(x-1)*x*(x+1) is factorial of (x+1), so (x+1)!. Where do you see negative numbers there?
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