यदि समांतर श्रेढ़ी \(2.5,5,7.5,10,\ldots\) दी हो, तो (9)वाँ पद क्या होगा?
If the AP \(2.5,5,7.5,10,\ldots\) is given, what will be the (9)th term?
Explanation opens after your attempt
Correct Answer
B. (22.5)
Concept
Here (a=2.5), (d=2.5), so \(a_9=2.5+8\times2.5=22.5\). The same formula applies to decimals.
Why this answer is correct
The correct answer is B. (22.5). Here (a=2.5), (d=2.5), so \(a_9=2.5+8\times2.5=22.5\). The same formula applies to decimals.
Exam Tip
यहाँ (a=2.5), (d=2.5) है, इसलिए \(a_9=2.5+8\times2.5=22.5\)। दशमलव में भी वही सूत्र लागू होता है।
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