Logarithm
|
| If log10 7 = a, then log10 |  |
1 |  |
is equal to: |
| 70 |
A
- (1 + a)
B
(1 + a)-1
C
| a |
| 10 |
D
| 1 |
| 10a |
ANS:A - - (1 + a)
|
= log10 1 - log10 70 | |||||
| = - log10 (7 x 10) | ||||||
| = - (log10 7 + log10 10) | ||||||
| = - (a + 1). |
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