Question

How to do this T-T?

The difference between 20th and 40th term is 40. Find the 100th term if the second
term is 2.​

Answer 1

198

Explanation:

t20=a+19d.......1

t40=a+39d.......2

t2=a+d=2.........3

According to ques,

t40-t20=a+39d-(a+19d)=40

or,20d=40

or,d=2

Now ,putting the value of d in equation 3,we get,

a=0

t100=a+99d

=0+99×2

=198