K=1! +2! +3! …+25!. What would be the last digit of K?
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Answer – 3
Explanation-
K = 1! + 2! + 3! …….. + 25!
Last digit of K = Last digit (1!) + Last digit (2!) + Last digit (3!) …….. + Last digit (25!)
Last digit (1!) = 1
Last digit (2!) = 2
Last digit (3!) = 6
Last digit (4!) = 4
Last digit (5!) = 0
Last digit (6!) = 0
.
.
.
Last digit (25!) = 0
Please note that Last digit (n!) such that n > 4 will be 0
Last digit of K = 1 + 2 + 6 + 4 + 0 + 0 + 0 … 0 = 3
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