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Trần Triệu Tân

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If b9bb7 - b9cbc = ca6 find number abc. Multiple solutions may exist.
In the following circles, the four outer numbers are used to calculate the number in the middle. Can you figure out the rule to determine what number should replace the question mark in the third circle?
How Many Squares Are There?

Subrahmanyan Chandrasekhar

Died 21 Aug 1995 at age 84 (born 19 Oct 1910). Indian-American astronomer and astrophysicist who shared (with William A.Fowler) the 1983 Nobel Prize for Physics for formulating the currently accepted theory on the later evolutionary stages of massive stars (which has led to the discovery of black holes and neutron stars). He was one of the first scientists to combine the disciplines of physics and astronomy. Early in his career he demonstrated that there is an upper limit, now called the Chandrasekhar limit, to the mass of a white dwarf star. (A white dwarf is the last stage in the evolution of a star such as the Sun, which ends with collapse when the nuclear energy source in its centre has become exhausted.) Further, it shows that stars much more massive than the Sun must either explode or form black holes.

Being rude is easy

Being rude is easy. It does not take any effort and is a sign of weakness and insecurity. Kindness shows great self-discipline and strong self-esteem. Being kind is not always easy when dealing with rude people. Kindness is a sign of a person who has done a lot of personal work and has come to a great self-understanding and wisdom. Choose to be kind over being right and you’ll be right every time because kindness is a sign of STRENGTH.

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