I got this question in a maths competition. the question was that what was the remainder of the equation given below when divided by 10.
i personally do not what to do with the n!
no i am in kindda in high school still lol
sorry =/ but u can tell me whateva i need to learn to solve this thereby i can learn some of it online,
yes i knw n! mod 10 = 0
yes i did make that observation that n! in mod 10 is 0 for all values of n more than equal to 5...but still lost :L