Question

Find the 20th term the last term of the AP : 3,8,13.....,253.​

Answer 1

Step-by-step explanation:

We have, an = Last term = 253

and

 d = Common difference = 8 - 3 = 5

∴ 20th term from the end = an - (20 - 1)d

               = an - 19d

        = 253 - 19 × 5

            = 253 - 95 = 158

Answer 2

Answer:

given A P = 3,8,13,.....253

here,

a = 3

d = 8- 3 = 5

since, l = a + (n-1)d

so , T20 = a + 19d

= 3 + 19 × 5

= 3 + 95

= 98