Question

120. Which number is wrong in the following series?
42, 110, 132, 210, 440, 506
(a) 42
(b) 132
(c)440
(d) 506​

Answer 1

440 is  wrong in the series 42, 110, 132, 210, 440, 506

Given:

• Series
• 42, 110, 132, 210, 440, 506

To Find:

• Wrong number in the series

Solution:

Step 1:

Understand the series

42 = 6 x 7

110 = 10 x 11

132 = 11 x 12

210 = 14 x 15

440 = 20 x 22

506 = 22 x 23

Step 2:

Conclude that All numbers are product of two consecutive integers Except 440

Hence, 440 is wrong in the series

Correct option is c) 440