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Four different electronic devices make a beep after every 30 minutes, 1 hour, `1(1)/(2)` hour and 1 hour 45 minutes respectively. All the devices beeped together at 12 noon.They will again beep together at:

A

12 midnight

B

3 a.m.

C

6 a.m.

D

9 a.m.

Text Solution

Verified by Experts

The correct Answer is:
D
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