On a touchtone phone, each button produces a unique sound. the sound produced is

Mathematics
Tutor: None Selected Time limit: 1 Day

Dec 12th, 2014

9 key : 852 cycles per sec +1477 cycles per sec = 2329 cycles per sec

Dec 12th, 2014

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Dec 12th, 2014
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Dec 12th, 2014
Dec 4th, 2016
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