Question

Two number series, I and II, are given below, which contain a missing term ‘x’ and ‘y’ respectively. Each series follows a different pattern. Series I: 12, 14, 31, x, 399, 2006 Series II: 19, 42, y, 264, 796, 1596 Find the relationship between ‘x’ and ‘y’.

Q: Answer-Two number series, I and II, are given below, which contain a missing term ‘x’ and ‘y’ respectively....

Series I Multiplication by successive numbers and addition of successive prime numbers. 12 X 1 2 14 14 X 2 3 31 31 X 3 5 98 98 X 4 7 399 399 X 5 11 2006 So, x 98 Series II Alternative multiplication by 2 and 3 followed by the addition of 4 19 X 2 4 42 42 X 3 4 130 130 X 2 4 264 264 X 3 4 796 796 X 2 4 1596 So, y 130 So, x lt y. Hence, option B.