अनुक्रम \(3,10,17,24,\ldots\) में कौन-सा पद (80) है?
In the sequence \(3,10,17,24,\ldots\), which term is (80)?
Explanation opens after your attempt
C. (12)वाँ(12)th
Concept
(a_n=3+(n-1)7=7n-4), so (7n-4=80) gives (n=12). Form the rule and set it equal to the given term.
Why this answer is correct
The correct answer is C. (12)वाँ / (12)th. (a_n=3+(n-1)7=7n-4), so (7n-4=80) gives (n=12). Form the rule and set it equal to the given term.
Exam Tip
(a_n=3+(n-1)7=7n-4), इसलिए (7n-4=80) से (n=12)। नियम बनाकर दिए पद के बराबर रखें।
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