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 1 of 2.
Krishna said:
9 years ago
Why not we consider m=121 and n=1?
(2)
Surbhi said:
6 years ago
Simple if the statement said m^ =121.
m^=11 to the power 2.
Therefore m=11.
^ = 2.
(^) this is assigned by n.
m^=11 to the power 2.
Therefore m=11.
^ = 2.
(^) this is assigned by n.
(2)
Naren said:
9 years ago
120^2 is exactly right until we have related options.
(1)
Name said:
9 years ago
Why we have taken m = 11 and n = 2 here? We can also take m= 121 and n = 1.
(1)
Krishna said:
1 decade ago
For 121 it is ok, if it is not 121 then?
if 16, we can assume 2^4 or 4^2.
is there other method ?
if 16, we can assume 2^4 or 4^2.
is there other method ?
Ankit Agarwal said:
1 decade ago
121^1 so m=121 n=1 in this case answer is 120^2.
Siri said:
10 years ago
How can we assumed exact n value as 2 here as a natural number are whole number.
Sowmi said:
9 years ago
It is doubtful. Please give the answer clearly.
Arman said:
6 years ago
How n=2?
Kiruthiga said:
5 years ago
In this sum, how n=2 is came? Explain please.
Post your comments here:
Quick links
Quantitative Aptitude
Verbal (English)
Reasoning
Programming
Interview
Placement Papers