TCS Company Numerical Ability Number System

1(1!)+2(2!)+3(3!)....2012(2012!) = ?

Read Solution (Total 3)

1(1!)=1 ⇒ 2!-1
1(1!)+2(2!)=1+4=5 ⇒ 3!-1
1(1!)+2(2!)+3(3!)=1+4+18=23 ⇒ 4!-1
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1(1!)+2(2!)+3(3!)+........+2012(2012!)=2013!-1
11 years agoHelpfull: Yes(38) No(0)

we can write above expression in this form..
=(2-1)1!+(3-1)2!+(4-1)3!+.......+(2013-1)2012!
=2!-1!+3!-2!+4!-3!...........+2013!-2012!
=2013!-1!
11 years agoHelpfull: Yes(10) No(0)
1(1!)=1 ⇒ 2!-1
1(1!)+2(2!)=1+4=5 ⇒ 3!-1
1(1!)+2(2!)+3(3!)=1+4+18=23 ⇒ 4!-1
........................
.......................
1(1!)+2(2!)+3(3!)+........+2012(2012!)=2013!-1
11 years agoHelpfull: Yes(0) No(0)

TCS Other Question

. A circle has 29 points arranged in a clock wise manner from o to 28. A bug moves clockwise manner from 0 to 28. A bug moves clockwise on the circle according to following rule. If it is at a point i on the circle, it moves clockwise in 1 sec by (1 + r) places, where r is the remainder (possibly 0) when i is divided by 11. If it starts in 23rd position, at what position will it be after 2012 sec. 49 members attended the party. In that 22 are males and 27 are females. The shake hands are done between males,females,males and females. Total 12 people given shake hands. How many such kinds of such shake hands possible?