Question
In each of the following number series, one term is
wrong. Find the wrong term. 2, 6, 18, 54, 150, 486, 1458Solution
Check ratio (multiplication pattern): 6 ÷ 2 = 3 18 ÷ 6 = 3 54 ÷ 18 = 3 150 ÷ 54 ≈ 2.78 (not 3) 486 ÷ 150 ≈ 3.24 (not 3) 1458 ÷ 486 = 3 Clearly, the intended pattern is multiplication by 3 each time: Correct series: 2, 6, 18, 54, 162, 486, 1458 So the term which breaks the pattern is 150 (it should have been 162).
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