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There are five odd numbers $1, 3, 5, 7, 9$ . What is the HCF of these odd numbers?

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2

1

6

5

answer is B.

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Detailed Solution

Given odd numbers are 1, 3, 5, 7, and 9.
We need to find the HCF of these odd numbers.
Finding the factors of all the given odd numbers,
Factors of

1 = 1

Factors of

3 = 1, 3

Factors of

5 = 1, 5

Factors of

7 = 1, 7

Factors of

9 = 1, 3, 9

Since, there is only one common factor in all the numbers i.e., 1, therefore, HCF is

1

for the five odd numbers.
Thus, HCF is 1.
Hence, option 2 is correct.

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