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A source of sound is travelling towards a stationary observer. The frequency of sound heard by the observer is three times the original frequency. Velocity

A source of sound is travelling towards a stationary observer. The frequency of sound heard by the observer is three times the original frequency. Velocity of the sound is V m/s .The speed of source is ?

a) 2v/3

b) v

c) 3v/2

d) 3v

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