Question Details

A Question is given followed by two Statements I and II. Consider the Question and the Statements.


Question: What are the values of m and n, where m and n are natural numbers?

Statement-I : m+n>mn and m>n.

Statement-II : The product of m and n is 24.

Which one of the following is correct in respect of the above Question and the Statements?

Options

A

The Question can be answered by using one of the Statements alone, but cannot be answered using the other Statement alone

B

The Question can be answered by using either Statement alone

C

The Question can be answered by using both the Statements together, but cannot be answered using either Statement alone

D

The Question cannot be answered even by using both the Statements together

Show Answer

Correct Answer :

Option C

The Question can be answered by using both the Statements together, but cannot be answered using either Statement alone

Solution :

The correct option is: The Question can be answered by using both the Statements together, but cannot be answered using either Statement alone.

Let us analyze the question and the statements step-by-step to understand why this option is correct.

The question asks for the unique values of m and n, given that m and n are natural numbers (m,n{1,2,3,...}).

Analysis of Statement-I:
Statement-I states: m+n>mn and m>n.
Let us test some small natural numbers. If we set n=1, the inequality m+n>mn becomes:
m+1>m
which is always true for any natural number m.
Since m>n, m can be any natural number greater than 1 (i.e., m{2,3,4,...}).
For example, (m,n) could be (2,1), (3,1), (4,1), and so on. Since there are infinitely many such pairs, Statement-I alone is not sufficient to determine unique values for m and n.

Analysis of Statement-II:
Statement-II states: The product of m and n is 24, which means:
m·n=24
Since m and n are natural numbers, the possible pairs for (m,n) are:
(1,24),(2,12),(3,8),(4,6),(6,4),(8,3),(12,2),(24,1)
Since there are multiple possible solutions, Statement-II alone is not sufficient to determine unique values for m and n.

Combining Statement-I and Statement-II:
Now we combine the conditions from both statements. We need a pair of natural numbers (m,n) such that:
1) m·n=24 (From Statement-II)
2) m+n>mn (From Statement-I)
3) m>n (From Statement-I)
Substituting mn=24 into the inequality (2), we get:
m+n>24
Let us evaluate our list of candidate pairs from Statement-II where m>n:
- For (m,n)=(6,4): m+n=6+4=10, which is not greater than 24.
- For (m,n)=(8,3): m+n=8+3=11, which is not greater than 24.
- For (m,n)=(12,2): m+n=12+2=14, which is not greater than 24.
- For (m,n)=(24,1): m+n=24+1=25, which is greater than 24 (25>24).
Thus, the only pair that satisfies all conditions is (m,n)=(24,1).
Since we obtain a unique solution when using both statements together, the question can be answered by using both statements together, but cannot be answered using either statement alone.

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