What is 1! + 2! + ... + 10! ?	Pick one:
A) 4,037,910	B) 4,037,913	C) 4,037,915	D) 4,037,916	E) 4,037,918
All options have different Unit digit so calculating unit digit of the sum above will suffice   Unit digit of (1! + 2! + 3! + 4! + 5! + 6!+... + 10!) = 1 + 2+ 6 + 4 + 0 + 0 + 0 + 0+ 0 + 0 = Unit digit 3, Hence   every Factorial of an integer greater than 4 will have Unit digit 0 as it will be a multiple of 10   Answer: option 4,037,913
<result>B</result>
What is 1! + 2! + ... + 10! ?