(Study Material) RRB NTPC (Tier -2) Exam (Numerical Aptitude) - Indices and Surds

(Study Material) RRB NTPC (Tier -2) Exam (Numerical Aptitude) - Indices and Surds

1. Determine a possible value of x from the equation 5^x–2 × 2^3x/x+1 = 4.

(a) 0
(b) 4
(c) 2
(d) 3

2. The least value of 3^x + 3^–x is

(a) 2
(b) 1
(c) 0
(d) 2/3

3.

4. If a = –5 and b = –6, find the value of (a – b)^b–a + (b – a)^a–b.

(a) 1
(b) –1
(c) 0
(d) –2

5. In Republic Day Parade, 6440 NCC cadets were asked to stand in rows to form a perfect square. It was found that 40 NCC cadets were left out. What was the number of NCC cadets in each row?

(a) 40
(b) 80
(c) 64
(d) 60

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