Anyone who can actually give me the statistical probability for getting a Legendary Item out of a Rare Engram and can defend why having the probability being that low makes sense wins one cookie.
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That sucks, I have gotten a purple from blues when I walk up with about 4 engrams. Your personal percentage at that moment was zero, that does not mean that the percentage to get purples from blues is zero. I can say that I have gotten lucky with engrams, having only purchased 2 exotics, the rest have been drops or rewards (besides the exotic bounties)