Question

A series is 11, 20, 42, 82, 166, 330

If another series 4, a, b, c, d, 106 follows the same pattern as the given number series, then find the approximate value of (c + d) x (c – a)%.

A 10 Correct Answer Incorrect Answer
B 16 Correct Answer Incorrect Answer
C 17 Correct Answer Incorrect Answer
D 19 Correct Answer Incorrect Answer
E 20 Correct Answer Incorrect Answer

Solution

11, 20, 42, 82, 166, 330 11 x 2 – 2 = 20 20 x 2 + 2 = 42 42 x 2 – 2 = 82 82 x 2 + 2 = 166 166 x 2 – 2 = 330 So, we will follow same pattern in series 4, a, b, c, d, 106. 4 x 2 – 2 = 6 (a) 6 x 2 + 2 = 14 (b) 14 x 2 – 2 = 26 (c) 26 x 2 + 2 = 54 (d) 54 x 2 – 2 = 106 Now, (c + d) x (c – a)% => (26 + 54) x (26 – 6)% => 80 x 20/100 = 16

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