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Find number abc

If ca3a9 - c3b41 = 1a1b find number abc. Multiple solutions may exist.

Correct answers: 21

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They were looking down into th...

They were looking down into the depths of the Grand Canyon. "Do you know," asked the guide, "that it took millions and millions of years for this great abyss to be carved out?"
"Well, I'll be darned," exclaimed the traveler. "I never knew this was a government job."

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Francesco Maria Grimaldi

Born 2 Apr 1618; died 28 Dec 1663 at age 45.Italian physicist and mathematician who studied the diffraction of light. He observed the image on a screen in a darkened room of a tiny beam of sunlight after it passed pass through a fine screen (or a slit, edge of a screen, wire, hair, fabric or bird feather). The image had iridescent fringes, and deviated from a normal geometrical shadow. He coined the name diffraction for this change of trajectory of the light passing near opaque objects (though, more specifically, it may have been interferences with two close sources that he observed). This provided evidence for later physicists to support the wave theory of light. With Riccioli, he investigated the object in free fall (1640-50), and found that distance of fall was proportional to the square of the time taken.«

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