Question

31, 35, 43, 50, 55, 65, 80, 89. Find the wrong number of the series
(a) 35 (b) 50 (c) 80
(d) 89
(e) 31​

Answer 1

Answer:

80 is the wrong number in this series

Answer 2

The required "option (c) 80" is correct.

Step-by-step explanation:

The given sequence are:

31, 35, 43, 50, 55, 65, 80, 90

To find, the wrong number of the series = ?

There are two sequences:

First sequence (Odd paces):

31, 43, 55, 80

The pattern follow:

+ 12, + 12, + 12,...

43 = 31 + 12 = 43

55 = 43 + 12 = 55

80 = 55 + 12 = 67 ≠ 80

Second sequence (Even paces):

35, 50, 65, 90

The pattern follow:

+ 15, + 15, + 15,...

50 = 35 + 15 = 50

65 = 50 + 15 = 65

90 = 65 + 15 = 90

∴ The wrong number of the series = 80

Thus, the required "option (c) 80" is correct.