Reasoning for SSC CHSL & RRB PART-1

1. Find the missing term?

1	3	10
2	6	37
8	4	?

(a) 30

(b) 16

(c) 17

(d) 24

Ans.(c)

Sol. In 1^st row:

1⁰ + 3² = 10

In 2^nd row:

2⁰ + 6² = 37

Similarly in 3^rd row:

8⁰ + 4² = 1 + 16 = 17

2. If A > B, B > C and C > D, then which of the following conclusions is definitely wrong? 

(a) A > D

(b) A > C

(c) D > A

(d) B > D

Ans.(c)

Sol. A > B, B > C, C > D ⇒ A > B > C > D ⇒ A > D ⇒ D ≯ A. So, (c) is false.

3. If ÷ implies =, × implies <, + implies >, - implies ×, > implies ÷, < implies +, = implies -, identify the correct expression.  

(a) 1 - 3 > 2 + 1 - 5 = 3 - 1 < 2

(b) 1 - 3 > 2 + 1 × 5 = 3 × 1 > 2 

(c) 1 × 3 > 2 + 1 × 5 × 3 - 1 > 2

(d) 1 - 3 > 2 + 1 × 5 + 3 - 1 > 2 

 Ans.(d)

Sol. Using the proper notations in (d), we get the statement as: 

1 × 3 ÷ 2 > 1 < 5 > 3 × 1 ÷ 2 or 3/2 > 1 < 5 > 3/2, which is true.