Question

Which term of ap 21,42,63,84.... is 210​

Answer 1

In the given A.P ;

a = 21

d = 42-21 = 21

l = 210

n = ?

l = a +(n-1)d

210 = 21+(n-1)21

n-1 = 189/21

n = 9+1

n = 10

hence 210 is the 10th term of given A.P

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Answer 2

Answer:

Step-by-step explanation:

In the given A.P ;

a = 21

d = 42-21 = 21

l = 210

n = ?

l = a +(n-1)d

210 = 21+(n-1)21

n-1 = 189/21

n = 9+1

n = 10

hence 210 is the 10th term of given A.P