Find the remainder when 1! +2! +3! +4! +5! +.................100! is divided by 24.
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Given : 2 4 1 ! + 2 ! + 3 ! + . . . . . . . . + 1 0 0 !
Now it can also be written as 2 4 1 + 2 4 1 ∗ 2 + 2 4 1 ∗ 2 ∗ 3 + 2 4 1 ∗ 2 ∗ 3 ∗ 4 + ............ + 2 4 1 ∗ 2 ∗ 3 ∗ 4 ∗ 5 ∗ 6 ∗ . . . . . . ∗ 1 0 0
But 4! =24
Therefore every no. after 4! will give a quotient and will leave a remainder 0 ( For example 5! will give quotient 5 and remainder zero ).
This means that remainder will be equal to 1! + 2! + 3! which is 1 + 2 + 6 = 9