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solve/simply 1(1!)+2(2!)+3(3!)+...........+2012(2012!)

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for this type of question there s a formula...
1(1!)+2(2!)+3(3!)+...........+N(N!) = (N+1)!-1!
so the ans wil be 2013!-1!..
u can check for N=3, 1+ 4+ 18=23=4!-1!
12 years agoHelpfull: Yes(29) No(0)

can any one xplain dis...plz
12 years agoHelpfull: Yes(2) No(1)
1(1!)+2(2!)=3!-1
so
(2012+1)!-1 is the ans
12 years agoHelpfull: Yes(2) No(0)

TCS Other Question

f(x^2) = [f(x)^2] = f(f(x)).How many polynomials of degree greater than 2 satisfy the above equation. The perimeter of a equilateral triangle and regular hexagon are equal.Find out the ratio of their areas?
1)3:2
2)2:3
3)1:6
4)6:1