अनुक्रम \(3,6,10,15,21,\ldots\) में (20)वाँ पद क्या होगा?
What will be the (20)th term in the sequence \(3,6,10,15,21,\ldots\)?
Explanation opens after your attempt
C. (231)
Concept
This sequence gives (\frac{(n+1)(n+2)}{2}). For the (20)th term, \(\frac{21\times22}{2}=231\).
Why this answer is correct
The correct answer is C. (231). This sequence gives (\frac{(n+1)(n+2)}{2}). For the (20)th term, \(\frac{21\times22}{2}=231\).
Exam Tip
यह अनुक्रम (\frac{(n+1)(n+2)}{2}) देता है। (20)वें पद के लिए \(\frac{21\times22}{2}=231\) होगा।
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