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Question 8
Which term of an AP : 21, 42, 63, 84, …. is 210?

A) 9th
B) 10th
C) 11th
D) 12th

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Solution

Let nth term of the given AP be 210.
Here, first term,
a = 21
And common difference,
d = 42 – 21 = 21 and
an = 210

an=a+(n1)d
210 = 21 + (n - 1)21
210 = 21 + 21n - 21
210 = 21n
n = 10
Hence, the 10th term of the AP is 210.


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