Question

S= 1!+4!+7!+....+400! Then tens digit of s os

Answer 1

Answer:

The tenth term of the series,S is 28.

Step-by-step explanation:

Here;

a(first term)=1

d(common difference)=3

Therefore,

tenth term= a+( 10-1)d

=a+9d

=1+9×3

=28