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Answer:
The number is 17
Step-by-step explanation:
Circle man ez
The number of subsets=2ⁿ where n=4 members
2ⁿ=2⁴=16
Number of proper subsets=2ⁿ-1
16-1=15
61 m^3
The difference in volume is (5 m)^3 - (4 m)^3, or (125 - 64) m^3, or