A) (3, 12)
B) (4, 9)
C) (2, 18)
D) (7, 6)
Correct Answer: B
Solution :
According to condition \[=\frac{n(n+1)}{2}\left[ \frac{n(n+1)}{2}+\frac{2n+1}{3} \right]\] and \[a+b=13\] On solving, we get \[a=4,\ b=9\].
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