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UPSC 2017 CDS I Math Paper
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© examsnet.com
Question : 6
Total: 100
What is the number of digits in
2
40
?
(Given that
l
o
g
10
2
=
0.301
)
[2017 CDS-I]
14
13
12
11
Validate
Solution:
Let
x
=
2
40
Taking logarithm on both sides, we have
logx
=
40
log
2
=
40
×
0.301
=
12.04
Therefore, the number of digits in
2
40
=
12
+
1
=
13
© examsnet.com
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