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

Answer 1

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