यदि किसी AP में \(a_5+a_9=60\) और (d=3) है, तो \(a_7\) क्या होगा?
If in an AP \(a_5+a_9=60\) and (d=3), what is \(a_7\)?
Explanation opens after your attempt
Correct Answer
B. (30)
Concept
In an AP, the average of equally spaced terms is the middle term, so \(a_7=\frac{60}{2}=30\). For symmetric terms, the average method is faster.
Why this answer is correct
The correct answer is B. (30). In an AP, the average of equally spaced terms is the middle term, so \(a_7=\frac{60}{2}=30\). For symmetric terms, the average method is faster.
Exam Tip
AP में समान दूरी वाले पदों का औसत बीच वाला पद होता है, इसलिए \(a_7=\frac{60}{2}=30\)। सममित पदों में औसत विधि तेज होती है।
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