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Time: 1 hr. 15 min. A person is permitte...

Time: 1 hr. 15 min. A person is permitted to select at least one and at most n coins from a collection of 211 + 1 distinct coins. If the total number of ways in which he can select coins is 255, then n equals (a) 4 (b) 8 (c) 16 (d) 32 2. If -2=2. then the greatest

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