Science, asked by 18p3490, 8 months ago

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

Please answer this question...
Will mark you as Brainliest and will also thank your answer...

Answers

Answered by max1351

7

Answer:

supersonic aeroplane

Answered by NiraliHarwani

6

Answer:

b.

Explanation:

Motorised boats...

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