1. The least value of 3^x + 3^–x is
(a) 2
(b) 1
(c) 0
(d) 2/3

2. 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

3. In Republic Day Parade, 6440 NCC cadets were asked to stand in rows to form a perfect square. It was fond 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

4. Two numbers are in the ratio of 9 : 7. If the difference of their squares is 288, then the smaller of the number is:
(a) 21
(b) 23
(c) 27
(d) 28

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