Oh, dude, factor pairs for 15? Like, let me think for a sec... Alright, so 1 and 15 are a pair, then there's 3 and 5. That's it, man. Like, those are the only pairs you're gonna get for 15. Hope that helps, or whatever.
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15 and 30 have a GCF of 15. There are other such pairs.
The factor pairs of 260 are (260,1), (130,2), (65,4), (52,5), (26,10), and (20,13)
1 x 45, 3 x 15, 5 x 9
1350,1675,2450,3270,5225,6150,9135,1090,1575,1854,2550,2745,30
5, 10 15, 20 500, 505