You seem to not know how Three of coins work if you believe 30+ is "possible" with that amount.
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Lol u can get 30 out of 30 if ur lucky and use one very rarely. I'm well aware of the actual drop rate
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"If you get very lucky" Please, even when 3 of coins was exploitable I never received exotic engrams back to back, there's no possible chance to get an exotic from each one, especially since the patch. Buy 30 three of coins when xur comes tomorrow and tell me how "lucky" you are.
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There is a chance, but it's incredibly low.