NMMS Rajasthan Mental Ability 2018 Practice Question

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NMMS Rajasthan - Questions - Mental Ability - PYQ - 2018 - 5

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NMMS Rajasthan · MAT · 2018 . PYQ

Find the wrong term in the series: 1, 3, 7, 15, 27, 63, 127

Explanation

This series should follow the rule 'double the previous term and add 1': 1x2+1=3, 3x2+1=7, 7x2+1=15, 15x2+1=31, 31x2+1=63, 63x2+1=127. The term '27' does not fit this rule; it should have been 31. So 27 is the wrong term.

PRO TIP

Re-check your working by substituting the answer back into the original question.

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