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Find number abc

If 9a82b - 798ca = 1a967 find number abc. Multiple solutions may exist.

Correct answers: 3

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Undercover Detective

A tourist asks a man in uniform, "Are you a policeman?"
"No, I am an undercover detective."
"So why are you in uniform?"
"Today is my day off."

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Light theory

In 1827, William Rowan Hamilton presented his Theory of Systems of Rays at the Royal Irish Academy in Dublin. Although he was still an undergraduate, only 21 years old, his work is one of the important works in optics, for it provided a single function that brings together mechanics, optics and mathematics. It led to establishing the wave theory of light, which gives that light is a form of energy that travels in waves.

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