What is the greatest common divisor of 18 and 45?

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Solution

The correct option is B
9

Greatest common divisor and highest common factor (HCF) are both same.
The factors of 18 are 1,2,3,6,9 and 18.
The factors of 45 are 1,3,5,9,15 and 45.
It can be clearly observed that the HCF for 18 and 45 is 9.

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