A) 6
B) 7
C) 8
D) 9
Correct Answer: A
Solution :
: \[(7\times 3)+(4\times 8)=53,{{53}^{2}}=2809~\]\[(6\times 2)+(9\times 12)=120,\,\,{{120}^{2}}=4400\] \[\therefore \left( 5\times 13 \right)+\left( 15\times 1 \right)=80,\text{ }{{80}^{2}}=6400.\]You need to login to perform this action.
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