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Question
If 1 × 7 = 8, 2 × 7 = 16, 3 × 7 = 24, 4 × 7 = 32, then what is value of 9 × 7?
Options
63
72
81
90
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Solution
72
Explanation:
1 × 7 = (1 + 7) × 1 = 8
2 × 7 = 2 × (7 + 1) = 16
3 × 7 = 3 × (7 + 1) = 24
4 × 7 = 4 × (7 + 1) = 32
Similarly,
9 × 7 = 9 × (7 + 1) = 72
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