SSC CGL 2013 Tier 1 - 21 April

Instructions

In each of the following questions, a series is given, with one term missing, Choose the correct alternative from the given ones that will complete the series.

Question 170

7, 2 = 59; 5, 3 = 28; 9, 1 = 810; 2, 1 = 13; 5, 4 = ?

Solution

The first digit is formed by subtracting the numbers and the second (and third) digit(s) is formed by adding the numbers.

7,2 = (7-2),(7+2) = 59 

and 9,1 = (9-1),(9+1) = 8 10

Similarly, 5,4 = (5-4),(5+4) = 19

=> Ans - (A)

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