Question

Find the 20 th and 25 th terms of the ap 3,8,13,18,....

Answer 1

Answer:

20:-98

25:-123

Step-by-step explanation:

here,nth term=5n-2

so,20th term=100-2

=98

and,25th term=125-2

=123

Answer 2

Answer:

tn = a+(n- 1)d, a= 3,d= 5,(given)

Step-by-step explanation:

t20= 3+(n- 1)5

= 3+5n- 5

5n - 2

n = 2/5