A) 63
B) 81
C) 90
D) 99
Correct Answer: C
Solution :
The relationship is \[x:x\text{ }(x+1)\] \[7(7+1)=56\Rightarrow 7\times 8=56\] \[9(9+1)=90\Rightarrow 9\times 10=90\]You need to login to perform this action.
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