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# MATH PUZZLE: Can you replace...

MATH PUZZLE: Can you replace the question mark with a number?
The first user who solved this task is Sanja Šabović.
#brainteasers #math #riddles

### A couple, desperate to conceiv...

A couple, desperate to conceive a child, went to their priest and asked him to pray for them. "I'm going on a sabbatical to Rome," he replied, "and while I'm there, I'll light a candle for you."
When the priest returned three years later, he went to the couple's house and found the wife pregnant, busily attending to two sets of twins. Elated, the priest asked her where her husband was so that he could congratulate him.
"He's gone to Rome, to blow that candle out" came the harried reply.
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### Jean-Robert Argand

Born 18 Jul 1768; died 13 Aug 1822 at age 54.Swiss accountant and mathematician who was one of the earliest to use complex numbers, which he applied to show that all algebraic equations have roots. His name is associated with the Argand diagram, a geometrical representation of complex numbers as points in a Cartesian plane, with the real portion of the number on the x axis and the imaginary part on the y axis. He self-published this concept in an anonymous monograph (1806). Though talented in mathematics, he remained an amateur; his livelihood was asan accountant and bookkeeper. Although Argand's name became associated with this idea, the geometrical interpretation of complex numbers appeared earliest in work by Caspar Wessel (1787), first presented on 10 Mar 1797 to a the Royal Danish Academy of Sciences and published in 1799.«
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