Find the common factors of the given terms:
$10 p q, 20 q r, 30 r p$

20 q

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10

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10 q

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2

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Solution

The correct option is B $10$
$10 p q$ , $20 q r$ , $30 r p$
Factors of $10 p q = 2 \times 5 \times p \times q$
Factors of $20 q r = 2 \times 2 \times 5 \times q \times r$
Factors of $30 p r = 2 \times 3 \times 5 \times r \times p$
Thus, the common factors $= 2 \times 5 = 10$

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