Aptitude Odd Man Out and Series Test Paper 1

Answer: C

Explanation:

The second number is one more than twice the first,
2 x 2 +1 = 5

The third number is one less than twice the second,
5 x 2 -1 = 9

The fourth number is one more than twice the third,
9 x 2 +1 = 19

The fifth number is one less than twice the fourth.
19 x 2 - 1 = 37

Therefore, the sixth number is one more than twice the fifth. So, the missing number:
37 x 2 + 1 = 75.

Answer: A

Explanation:

The terms of the given series are
(1³ - 1) = 1 -1 = 0,
(2³ - 1) = 8 - 1 = 7,
(3³ - 1) = 27 - 1 = 26,
(4³ -1) = 64 - 1 = 63.....

Answer: B

Explanation:

The given sequence is

x 2 + 2 i.e. 8 x 2 + 2 = 16+2 = 18,
x 2 + 4 i.e. 18 x 2+ 4 = 36+4 = 40,
x 2 + 6 i.e. 40 x 2 + 6 = 80+6 = 86,
x 2 + 8 i.e. 86 x 2 + 8 = 172+8 = 180,
x 2 + 10 i.e. 180 x 2 + 10 = 360+10 = 370,
x 2 + 12 i.e. 370 x 2 + 12 = 740+12 = 752.

Hence, the number 178 is wrong, and it should be replaced by 180.

Answer: A

Explanation:

In the given series, there are two sequences:
53, 52, 51, and 44,?, 46

In the first sequence, each digit is decreased by 1
i.e. 53, 52, 51

In the second sequence, each digit is increased by 1
44, 45, 46

Therefore 45 is the missing number.

Answer: C

Explanation:

The differences between consecutive terms are respectively 5, 7, 9, 11, and 13.
So, 34 is the wrong number.