Direction: In each of the following questions, all the equations except one have been solved according to a certain rule. You are required to solve the unsolved equation following the same rule and to choose the correct answer out of the given options.
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9 * 7 = 32, 13 * 7 = 120, 17 * 9 = 208, 19 * 11 = ?
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- 64
- 160
- 240
- 210
Correct Option: C
As, 9 * 7 ⇒ (9 + 7) (9 - 7) = 16 x2 = 32
13 * 7 ⇒ (13 + 7) (13 - 7) = 20 x 6 = 120
17 * 9 ⇒ (17 + 9) (17 - 9) = 26 x 8 = 208
Similarly, 19 * 11 ⇒ (19 + 11) (19 - 11) = 30 x 8 = 240
∴ ? = 240
