I signed up with promo code but didn't get $10

Mathematics
Tutor: None Selected Time limit: 1 Day

I signed up with a friends promo code but neither one of us got our $10 credit

May 3rd, 2015

the probability of both of you getting was rare this is because of the population who want the promotion is more

May 3rd, 2015

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May 3rd, 2015
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May 3rd, 2015
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