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Volume: Pi*radius^2*h (1m = 100cm) 22/7*(7:2)^2*100 = 3850 (cm3) => It can hold 3850 ml = 3.85 liters
The cycle: 7^1 7^2=..9 7^3=..3 7^4=..1 7^5=..7 => Every 4th power starts a new cycle of digits Divided the index number of 7^42 by 4 you have the remainder 2 => The last digit is 9
