Aptitude - Surds and Indices - Discussion
Discussion Forum : Surds and Indices - General Questions (Q.No. 13)
13.
If m and n are whole numbers such that mn = 121, the value of (m - 1)n + 1 is:
Answer: Option
Explanation:
We know that 112 = 121.
Putting m = 11 and n = 2, we get:
(m - 1)n + 1 = (11 - 1)(2 + 1) = 103 = 1000.
Discussion:
13 comments Page 2 of 2.
Kanishka Roy said:
3 years ago
This is wrong method because the value of m can easily be -11.
Ali said:
3 years ago
But it is given that it is a whole number so it can't be negative (-11).
Am I right?
Am I right?
Asad said:
3 years ago
@All.
It's surds and indices math.
The square root should be surds. That's why we cant take -11, 121.
It's surds and indices math.
The square root should be surds. That's why we cant take -11, 121.
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