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tn = 2n2 + 3n - 2
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The difference between the terms increases by 2 each time. 20-12=8 30-20=10 42-30=12 56-42=14 ... f(n)=(n+2)(n+3)
n(n+1)
3.5
12/42 = 2/7
The GCF of 12 and 42 is 6