Science, asked by 18p3490, 9 months ago

Which one of the following is not the 20th century contribution?
a) Electric train
b) Motorised boats
c) Monorail
d) Supersonic aeroplanes
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Answers

Answered by aswinmurali2006
3

Answer:

Electric train, motorised boats and monorails. They were all introduced in the 19th century.

Hope it helps

Answered by tanejakca
0
Except (d) all are 19th centuries contribution of
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