Question

Which term of the A.P: 21, 42,63,84,...is 210​

Answer 1

Step-by-step explanation:

Correct option is

B

10th

First term of the AP, a=21

Common difference d=21

nth term is 210

Then,

210=a+(n−1)d

210=21+(n−1)×21

210=21n

Therefore, n=10

Hence, 210 is 10th term of the series.

Answer 2

Answer:

the arithmetic progestation is 21

Step-by-step explanation:

42 - 21 =21

63 - 42 =21