Real Math Quiz

Question Number 1 a+b=b+a Which property is this? A. closure B. commutative C. associative D. reflexive Question Number 2 compounded ratio of a:b and c:d is? A. ac:bd B. ab:cd C. ad:bc D. cd:ab Question Number 3 what is ramanujan's number? A. 1730 B. 1728 C. 1727 D. 1729 Question Number 4 which is different from others? A. 9 B. 25 C. 31 D. 16 Question Number 5 which of the following belongs to set theorem? A. pi B. phi C. golden ratio D. euler constant