Fifteen wedding guests could not agree on who would stand in the wedding photo. The groom suggested that all possible sets of wedding guests be made in the photographs.
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I think the answer should be 2 exp 15, so 32,768. You can represent the possibilities if you have a binary string of 15 digits, where each digit corresponds to one guest, with a 1 for a guest on the picture, a 0 for a guest not in the picture.
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