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Question

Find the Greatest Common Divisor (GCD) of 10 and 21.

A
2
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B
3
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C
1
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D
GCD does not exist.
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Solution

The correct option is C 1
We know,
10=2×5
Factors of 10 are 1,2,5 and 10.

Also,
21=3×7
Factors of 21 are 1,3,7 and 21.

The largest common factor (GCD) is 1.

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