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Selma Solutions Ltd claims that its product has the ability to test up to 300,000,000 passwords in a second on a standard smartphone

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Selma Solutions Ltd claims that its product has the ability to test up to 300,000,000 passwords in a second on a standard smartphone. If you lost your smartphone, and the finder uses this system, how long will it take to break into your phone if the password consists of

(a) eight case sensitive letters without repeats?

(b) ten case sensitive letters?

(c) eight characters chosen from the alphabet, case sensitive and 10 digits?