Question

Find last two digits of the sum 1!+2!+3!+.......+500!

Answer 1

Step-by-step explanation:

The answer is 50 The last two digits are 5 and 0

Answer 2

Answer:

! means factorial. for example: 3!= 1×2×3=6 ( multiplying till number 3)

1!=1

2!=2

3!=6

4!=24

5!=120

from 5! the unit digit will be 0, so till number 4, we should add its unit digits,

so, 1+2+6+4=13 , unit digit here is 3 after number 10 , the unit digits will be 00...

So last two digits of sum are 13

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