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The question is based on the following text.
(1) Balloons were first invented in France in the late 18th century. (2) Two papermakers, Jacques and Joseph Montgolfier, discovered that when paper bags filled with hot air, the bags rise. (3) When realizing the potential of this, they began experimenting with balloons of various materials such as paper, cloth, and silk. (4) They made the first public demonstration of a lighter-than-air balloon in June 1783, with a 35-foot diameter balloon made of cloth lined with paper. (5) Later that year, Jacques Charles was flown a balloon made of silk coated with a rubber varnish and filled with hydrogen, a gas that is lighter than air. (6) These early demonstrations attracted a great deal of excitement, and balloons were soon put to many uses in science, sport, and war.
Which sentences should be revised?
1 and 4
2 and 5
3 dan 6
1 and 5
2 and 6
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