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A researcher wants an alarm to sound whe...

A researcher wants an alarm to sound when the temperature of air in his controlled research chamber rises above `40^@C` or falls below `20^@C`.The alarm can be triggered by the output of

A

AND gate

B

NAND gate

C

NOT gate

D

OR gate

Text Solution

Verified by Experts

The correct Answer is:
D
Because `Y=A+B` (OR gate )
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