Aptitude - Logarithm - Discussion
Discussion Forum : Logarithm - General Questions (Q.No. 1)
1.
Which of the following statements is not correct?
Answer: Option
Explanation:
(a) Since loga a = 1, so log10 10 = 1.
(b) log (2 + 3) = log 5 and log (2 x 3) = log 6 = log 2 + log 3
log (2 + 3) 
log (2 x 3)
(c) Since loga 1 = 0, so log10 1 = 0.
(d) log (1 + 2 + 3) = log 6 = log (1 x 2 x 3) = log 1 + log 2 + log 3.
So, (b) is incorrect.
Discussion:
37 comments Page 2 of 4.
Dhaval said:
8 years ago
D is also incorrect.
log(1+2+3) = log 1* log 2 * log 3.
log(1+2+3) = log 1* log 2 * log 3.
(1)
Crisna said:
5 years ago
Well said, Thanks @Yuvatharani.
(1)
Shivam Ghorpade said:
6 years ago
Thanks all for explaining.
(1)
Vikash said:
1 decade ago
log 6 = log(2*3) = log 2 + log 3.
But log(2+3) =log 5 which is not equal to log 6.
So, log(2+3) != log 2 + log 3.
But log(2+3) =log 5 which is not equal to log 6.
So, log(2+3) != log 2 + log 3.
(1)
SYLVESTER said:
9 years ago
The given answer is absolutely correct.
Begum said:
1 decade ago
Its great.
Venu said:
1 decade ago
If they say log 6 = log 2 + log 3, then log (2+3) = log 2 + log 3.
Can someone explain ?
Can someone explain ?
Tendai said:
1 decade ago
What about 243 base 9?
Akshayaa said:
1 decade ago
What about 828 with base 2?
Murali said:
1 decade ago
243 base 9.
This mainly 243 = 3*3*3*3*3 = 3^5.
And 9 = 3*3 = 3^2.
So answer is 5/2. I dot no how to write log in keyboard.
This mainly 243 = 3*3*3*3*3 = 3^5.
And 9 = 3*3 = 3^2.
So answer is 5/2. I dot no how to write log in keyboard.
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