Question

What is the unit’s place digit of the sum of all factorials from 0 to 1,000,000?

Answer 1

Answer:

$\huge\boxed{27000000}$

Step-by-step explanation:

The ans is 27000000. 1-1000000 same as sum of digits in 0 - 999999 then plus 1, treat 0 - 999999 as a 6 digit random number, then the digit of sum is sum of digit for each number: 1000000*(4.5*6)=27000000, so answer is 27000001.

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