समानांतर श्रेढ़ी \(21,28,35,42,\ldots\) का सामान्य पद कौन-सा है?
What is the general term of the arithmetic progression \(21,28,35,42,\ldots\)?
Explanation opens after your attempt
A. \(a_n=7n+14\)
Concept
The first term is (21) and (d=7), so (a_n=21+(n-1)7=7n+14). You can also check an option by putting (n=1).
Why this answer is correct
The correct answer is A. \(a_n=7n+14\). The first term is (21) and (d=7), so (a_n=21+(n-1)7=7n+14). You can also check an option by putting (n=1).
Exam Tip
पहला पद (21) और (d=7) है इसलिए (a_n=21+(n-1)7=7n+14)। विकल्प को (n=1) रखकर भी जांच सकते हैं।
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