Question

1+1.1!+2.2!+3.3!+---------+n.n!=?
Please answer my question

Answer 1

consider n=2

1*1!+2*2!=1+4=5

A=3 out

B=3!=6 out

C=6-1=5 OK

D=6+1=7 out

E=2+3=5 OK

consider n=3; S=5+18=23

C=23 OK

E=6+3=9 out

So,(n+1)!-1

hope it was helpful....

Answer 2

advance happy new year raa (bro ) ....