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Aptitude - Numbers

Exercise : Numbers - General Questions
136.
Which one of the following can't be the square of natural number ?
30976
75625
28561
143642
None of these
Answer: Option
Explanation:

The square of a natural number nerver ends in 2.

143642 is not the square of natural number.

137.
(1000)9 รท 1024 = ?
10000
1000
100
10
None of these
Answer: Option
Explanation:
Given Exp. = (1000)9 = (103)9 = (10)27 = 10(27-24) = 103 = 1000
1024 1024 1024
138.
{(476 + 424)2 - 4 x 476 x 424} = ?
2906
3116
2704
2904
None of these
Answer: Option
Explanation:
Given Exp. = [(a + b)2 - 4ab], where a = 476 and b = 424
= [(476 + 424)2 - 4 x 476 x 424]
= [(900)2 - 807296]
= 810000 - 807296
= 2704.
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