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Archipelago: An extensive group of islands.
Helium gas has almost the same lifting capacity and is not flammable, unlike hydrogen, but is rare and relatively expensive.
Prime Number: a number that is divisible only by itself and 1 (e.g. 2, 3, 5, 7, 11).
Prime Numbers between 30 to 50 are: 31, 37, 41, 43, 47
= 31+37+41+43+47 / 5
= 199/5
=39.8