Q: How many factor pairs do 90 have?

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90 and any factor of 90 for example, 10 and 90

30 has four factor pairs:30,115,210,36,5

(90,1)(45,2)(30,3)(18,5)(15,6)(10,9)

The factor pairs of 21 are:1, 213, 7Therefore, the number 21 has two pairs of positive integer factors.

"Dose" is a measured portion of a medicine. I am not aware of any factor pairs related to dose 27 or any other measured quantities of medication!27 does have 2 factor pairs.

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90 and any factor of 90 for example, 10 and 90

1,90,2,45,3,30,18,5,15,6 9,10

60, 72, 84, 90 and 96 have 6 factor pairs.

Sixteen factor pairs.

30 has four factor pairs:30,115,210,36,5

20 has 3 factor pairs. Pairs are (1,20), (2,10) and (9,9)

(90,1)(45,2)(30,3)(18,5)(15,6)(10,9)

(90,1)(45,2)(30,3)(18,5)(15,6)(10,9)

12 has 3 factor pairs and the pairs are (1,12), (2,6) and (3,4).

(90,1)(45,2)(30,3)(18,5)(15,6)(10,9)

76 has 3 factor pairs: (1,76), (2,38), (4,19).

One pair: it's a prime number.