Question

Find the unit digit of 1! + 2! + 3! + 4! + 5! + 6! + …..+ 100!?

Answer 1

Answer:

Step-by-step explanation:

1!=1

2!=2

3!=6

4!=4

there are unit digit

add all no 1+2+6+4=13

next up to 5 ! answer will 0 unit digit

13+0=13

answer will be 3