18. Find the unit digit in the expression+100!(a) 3(c) 6(b) 4(d) 8

1.	18. Find the unit digit in the expression+100!(a) 3(c) 6(b) 4(d) 8
Answer» 1! = 1 2! = 2 3! = 6 4! = 24 5! = 120 Factorials starting from 5! end with digit 0 because they will have at least one 2 and one 5 in their product…So they dont contribute in the last digit.. So, Last digit = 1 + 2 + 6 + 4 +0 =3

Answer»

1! = 1

2! = 2

3! = 6

4! = 24

5! = 120

Factorials starting from 5! end with digit 0 because they will have at least one 2 and one 5 in their product…So they dont contribute in the last digit..

So,

Last digit = 1 + 2 + 6 + 4 +0 =3

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18. Find the unit digit in the expression+100!(a) 3(c) 6(b) 4(d) 8

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