2(n-1)! simplify

((n-1)!/r!(n-r-1!)) + ((n-1)!/(r-1)!((n-1)-(r-1)))
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1 Answer

(n-1)!=1*2*3*4*5...*(n-1)

so 2*(n-1)!=2*6*8*10*...*(n-1)
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