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Question

If 5 × 9=144; 7 × 8=151; 4 × 6=102 then 2 × 5= ?

A
73
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B
77
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C
37
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D
97
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E
107
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Solution

The correct option is A 73
The rule is a ×× b = (5+9) (b-a)
2×5=(2+5)(52)=73

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