Class 10 Exam > Class 10 Questions > Which term of the A.P. 63, 84, …&helli...
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Which term of the A.P. 63, 84, …… is 399?
- a)13th
- b)17th
- c)23rd
- d)16th
Correct answer is option 'B'. Can you explain this answer?
Most Upvoted Answer
Which term of the A.P. 63, 84, …… is 399?a)13thb)17thc)2...
The correct answer is b
A=21
d=21
n=?
420=21+(n-1)21
(n-1)*21=399
n-1=399/21
n-1=19
n=19+1=20
therefore the 20th term of the AP is 420
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Which term of the A.P. 63, 84, …… is 399?a)13thb)17thc)2...
A=63,
d=84-63=21,
an=399,
n=?,
an=a+(n-1)d,
399=63+(n-1)21,
399-63=(n-1)21,
336/21=n-1,
16=n-1,
n=16+1=17
d=84-63=21,
an=399,
n=?,
an=a+(n-1)d,
399=63+(n-1)21,
399-63=(n-1)21,
336/21=n-1,
16=n-1,
n=16+1=17
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Which term of the A.P. 63, 84, …… is 399?a)13thb)17thc)23rdd)16thCorrect answer is option 'B'. Can you explain this answer? for Class 10 2025 is part of Class 10 preparation. The Question and answers have been prepared according to the Class 10 exam syllabus. Information about Which term of the A.P. 63, 84, …… is 399?a)13thb)17thc)23rdd)16thCorrect answer is option 'B'. Can you explain this answer? covers all topics & solutions for Class 10 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Which term of the A.P. 63, 84, …… is 399?a)13thb)17thc)23rdd)16thCorrect answer is option 'B'. Can you explain this answer?.
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