If t is a positive integer and r is the remainder when t^2 + 5t + 6 is divided by 7, what is the value of r?
(1) When t is divided by 7, the remainder is 6.
(2) When t^2 is divided by 7, the remainder is 1.
Source: GMAT Prep
If t is a positive integer and r is the remainder when
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