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Prime: 23, 29, 31, 37, 39, 41, 43, 49

Composite: 20=10x2, 21=3x7, 22=11x2, 24=8x3, 25=5x5, 26=13x2, 27=9x3, 28=14x2, 30=10x3, 32=8x4, 33=11x3, 34=17x2, 35=7x5, 36=6x6, 38=19x2, 40=10x4, 42=21x2, 44=11x4, 45=9x5, 46=23=2, 48=24x2, 49=7x7, 50=10x5

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Q: Which numbers between 20 and 50 are prime or composite?
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