Question
In each of the following questions, one number in the
series does not follow the pattern of the others. Identify that wrong number in the series. 4, 9, 19, 39, 80, 159, 319Solution
Check the pattern of multiplication and addition: 4 × 2 + 1 = 9 9 × 2 + 1 = 19 19 × 2 + 1 = 39 39 × 2 + 1 = 79 (but the series has 80) 79 × 2 + 1 = 159 159 × 2 + 1 = 319 So, instead of 79, we have 80 in the series. Therefore, 80 is the wrong number.
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