CA Foundation Exam > CA Foundation Questions > Which term of the AP, 21,42,63,84,... is 210?...
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Which term of the AP, 21,42,63,84,... is 210?
- a)9th
- b)10th
- c)11th
- d)12th
Correct answer is option 'B'. Can you explain this answer?
Verified Answer
Which term of the AP, 21,42,63,84,... is 210?a)9thb)10thc)11thd)12thCo...
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.
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.
Most Upvoted Answer
Which term of the AP, 21,42,63,84,... is 210?a)9thb)10thc)11thd)12thCo...
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.
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.
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Which term of the AP, 21,42,63,84,... is 210?a)9thb)10thc)11thd)12thCo...
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Which term of the AP, 21,42,63,84,... is 210?a)9thb)10thc)11thd)12thCorrect answer is option 'B'. Can you explain this answer?
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