TCS
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1(1!) + 2(2!)+3(3!)+….2012(2012!)=? A. 2013! -1 B.2013!+1 C.2013! D. none.
Read Solution (Total 2)
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- answer will be A
(2-1)(1!)+(3-1)(2!) + (4-1)(3!) +....... (2013-1)(2012!)
= 2!-1! + 3! -2! +4! -3!+........+2013!-2012!
= 2013! -1 - 9 years agoHelpfull: Yes(10) No(0)
- 2013! - 1
- 9 years agoHelpfull: Yes(0) No(0)
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