यदि \(a_n=kn^2+2n\) और \(a_4=56\) है तो \(a_7\) का मान क्या होगा?

If \(a_n=kn^2+2n\) and \(a_4=56\), what will be the value of \(a_7\)?

Author: Muft Shiksha Editorial Team Published:
Explanation opens after your attempt
Correct Answer

A. (161)

Step 1

Concept

From (16k+8=56), (k=3). Therefore \(a_7=3\times49+14=161\).

Step 2

Why this answer is correct

The correct answer is A. (161). From (16k+8=56), (k=3). Therefore \(a_7=3\times49+14=161\).

Step 3

Exam Tip

(16k+8=56) से (k=3) है। इसलिए \(a_7=3\times49+14=161\) होगा।

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Mathematics Answer, Explanation and Revision Hints

यदि \(a_n=kn^2+2n\) और \(a_4=56\) है तो \(a_7\) का मान क्या होगा? / If \(a_n=kn^2+2n\) and \(a_4=56\), what will be the value of \(a_7\)?

Correct Answer: A. (161). Explanation: (16k+8=56) से (k=3) है। इसलिए \(a_7=3\times49+14=161\) होगा। / From (16k+8=56), (k=3). Therefore \(a_7=3\times49+14=161\).

Which concept should I revise for this Mathematics MCQ?

From (16k+8=56), (k=3). Therefore \(a_7=3\times49+14=161\).

What exam hint can help solve this Mathematics question?

(16k+8=56) से (k=3) है। इसलिए \(a_7=3\times49+14=161\) होगा।