# MATH PUZZLE: Can you replace...

MATH PUZZLE: Can you replace the question mark with a number?Correct answers:

**291**The first user who solved this task is

**Donya Sayah30**.#brainteasers #math #riddles

Correct answers: **291**

The first user who solved this task is **Donya Sayah30**.

#brainteasers #math #riddles

## Jean le Rond D'AlembertDied 29 Oct 1783 at age 65 (born 16 Nov 1717). French mathematician known for his work in various fields of applied mathematics, in particular dynamics. In 1743 he published his Traité de dynamique (Treatise on Dynamics). The d'Alembert principle extends Newton's third law of motion, that Newton's law holds not only for fixed bodies but also for free moving bodies. D'Alembert also wrote on fluid dynamics, the theory of winds, the properties of vibrating strings and conducted experiments on the properties of sound . His most significant purely mathematical innovation was his invention and development of the theory of partial differential equations. He published eight volumes of mathematical studies (1761-80). He was editor of the mathematical and scientific articles for Denis Diderot's Encyclopédie. |

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