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43 = 3 + 10b
43-3 = 10b
b = 40/10
b = 4
Un = a + (n-1)b
Un = 3 + (n-1)4
Un = 3 + 4n - 4
Un = 4n - 1
u11=a+10b=43
=3-43=-10b
=-40/-10=b
b=4
Un=a+(n-1)b
3+(n-1)4
3+4n-4
Un=4n-1