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If order doesn't matter, 15 combinations and if order does matter, 360 combinations are possible.
its 4 possible combinations HA HA HA buy
There are 39 possible combinations to obtain $0.49. See the image below with the complete list of possible combinations.
24
Assuming that repeated numbers are allowed, the number of possible combinations is given by 40 * 40 * 40 = 64000.If repeated numbers are not allowed, the number of possible combinations is given by 40 * 39 * 38 = 59280.