Question

Which term of the AP 21,42,63,84……… is 210?
​

Answer 1

Answer:

D=42-21=21

An=a+( n-1)d

An=21+(n-1)×21

n-1=21+21

n-1=42

n=42+1

n=43

Step-by-step explanation:

I hope you understand questions

Answer 2

Step-by-step explanation:

first term of Ap=21

common difference d=21

nth term is 210

Then

210=a+(n-1)d

210=21+(n-1)×21

210=21n

n=210/21

n= 10

210 is 10 term of series