IIFT 2016 Question Paper Question 17

Question 17

In the following question, one term in the number series is wrong. Find out the wrong term.
10, 26, 74, 218, 654, 1946, 5834

Solution

The logic used in the given series is as follows:
10*3 - 4 = 30 - 4 = 26
26*3 - 4 = 78 - 4 = 74
74*3 - 4 = 222 - 4 = 218
218*3 - 4 = 654 - 4 = 650
650*3 - 4 = 1950-4 = 1946
1946*3 - 4 = 5838 - 4 = 5834

As we can see, 654 is the incorrect term in the series. 650 should have been there instead of 654. Therefore, option A is the right answer. 



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