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Verified answer
Un=a+(n-1)b=6+(n-1)2
=6+2n-2
=2n+4
Verified answer
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6,8,10,12,....
a= 6
b = U2-U1
b = 8-6
b = 2
Un= a+ (n-1).b
Un = 6 + (n-1).2
Un = 6 + 2n - 2
Un = 2n + 4