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Surds and Indices - Quantitative Aptitude (MCQ) questions for Q. 20790
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Surds and Indices
Q. If 5
a
= 625, then the value of 5
(a – 2)
is:
- Published on 07 Jul 17
a.
5
b.
25
c.
125
d.
625
ANSWER: 25
5
a
= 625
5
a
= 5
4
a = 4
Therefore,
5
(a – 2)
= 5
(4 – 2)
= 5
2
= 25
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