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Q1
:
If log
10
7 =
a
, then log
10
1
is equal to:
70
A
1
10
a
B
(1 +
a
)
-1
C
a
10
D
- (1 +
a
)
Solution
ANS:
A
- - (1 +
a
)
log
10
1
70
= log
10
1 - log
10
70
= - log
10
(7 x 10)
= - (log
10
7 + log
10
10)
= - (
a
+ 1).
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