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index notation MCQ Questions for Class 10

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Practice Questions

1 questions tagged with index notation.

यदि \(a_n=13n-6\) है, तो \(a_{5k}-a_{2k}=234\) के लिए (k) क्या होगा?

If \(a_n=13n-6\), what is (k) for \(a_{5k}-a_{2k}=234\)?

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Correct Answer

B. 6

Explanation

Simple Explanation

दिया है कि \(a_n=13n-6\)। अतः \(a_{5k}=13(5k)-6=65k-6\) और \(a_{2k}=13(2k)-6=26k-6\)। इसलिए \(a_{5k}-a_{2k}=(65k-6)-(26k-6)=39k\)। अब \(39k=234\), जिससे \(k=234/39=6\)। विकल्प 5 लेने पर अंतर केवल \(195\) होगा, इसलिए वह सही नहीं है। परीक्षा टिप: ऐसे प्रश्नों में पहले दोनों सूचकांकों को पद के सूत्र में अलग-अलग रखकर घटाइए। / Given \(a_n=13n-6\), we have \(a_{5k}=13(5k)-6=65k-6\) and \(a_{2k}=13(2k)-6=26k-6\). Hence, \(a_{5k}-a_{2k}=(65k-6)-(26k-6)=39k\). Now \(39k=234\), so \(k=234/39=6\). If \(k=5\), the difference would be only \(195\), so it is not correct. Exam tip: substitute each index separately in the term formula before subtracting.

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