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2 factor pairs

Q: How many factor pairs does 91 have?

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Two of them.

Eight of them.

Three of them.

225 has five factor pairs:225,175,345,525,915,15

12 has three factor pairs, six if you count their negative counterparts.

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The factor pairs of 91 are (1,91) and (7,13).

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)

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

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

"Dose" is a measured portion of a medicine. I am not aware of any factor pairs related to dose 18 or any other measured quantities of medication!18 does have 3 factor pairs.

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

Eight of them.

Two of them.

Two.

One.