Let S = 5^a +7^b + 11° +13^d, where a, b, c and d are natural numbers. What is the number of distinct remainders of S when it is divided by 10?

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…