If a : b : c : d = √4 : √3 : √2 : √1, then what is the value of  -a²+b²+c²+d²/a²-b²+c²-d²

Two dice each numbered from 1 to 6 are thrown together. Let A and B…

Two dice each numbered from 1 to 6 are thrown together. Let A and B…

An urn contains one black ball and one green ball. A second urn contains one…

An urn contains one black ball and one green ball. A second urn contains one…

What is the most probable number of successes in 10 trials with probability of success…