A) 33
B) 145
C) 135
D) 18
Correct Answer: C
Solution :
\[\text{15}\times \text{2}=\text{3}0,\text{2}\times \text{7}=\text{14},\] \[\text{7}\times \text{9}=\text{63},\text{9}\times \text{15}=\text{135}\] Hence, the missing number is 135.
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