Maths-
General
Easy

Question

Digit at unit place of sum (1!)2 +(2!)2 +(3!)2 ……… +(2008!)2 is

  1. 5
  2. 7
  3. 9
  4. None

The correct answer is: 7


    becauseS = 1 + 4 + 36 + 576 + …….. +(2008!)2= 617 + all other terms will have 0 at unit place

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