Well, I could trace the pattern a bit. Look, 7-3 = 124 i.e., 7-3 = 4 and 4*3 = 12 6+3 = 279 i.e., 6+3 = 9 and 9*3 = 27 Going by this, 15-3 = 12 and 12*3 = 36 Hence the answer is 15-3 = 3612. :)
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