Maths-
General
Easy
Question
Digit at unit place of sum (1!)2 +(2!)2 +(3!)2 ……… +(2008!)2 is
- 5
- 7
- 9
- None
The correct answer is: 7
S = 1 + 4 + 36 + 576 + …….. +(2008!)2= 617 + all other terms will have 0 at unit place
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