Question

Find the 20th term of the A.P. 1,11,21,...​

Answer 1

Answer:

a=1

d=10

a20= a+19d

= 1+19 ×10

= 1+ 190

= 191

Answer 2

a = 1

a+d = 11

a+2d = 21

To find : a+19d

common difference = 11-1 = 21-11 = 10

20 th term is = a+19d

1+19×10 = 191

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