Question

18. Find the unit digit of expression
निम्न व्यंजक का इकाई अंक होगा ?
1! + 2! +3!+4!+ ...................+100!​

Answer 1

Step-by-step explanation:

given..

a=1 ; d=1; An=100

Now,

An=a+(n-1)d

= 100=1+(n-1)1

=100-1=(n-1)

=99=n-1

=99+1=n

=100= n.

solve...