Astandard deck of 52 playing cards contains 13 cards in each of four suits: hearts, diamonds, clubs, and spades. four cars are drawn from the deck at random. what is the approximate probability that exactly three of the cards are diamonds

For the rule of 78, for a 12-month period, the last term in the sequence is 12 and the series sums to 78. for an 10 month period, the last term is and the series sum is . for a 15 month period, the last term is and the series sum is . for a 20 month period, the last term is and the series sum is

The measure of one angle of an octagon is two times smaller that of the other seven angles. what is the measure of each angle?

How many sides does a regular polygon have if each exterior angle measure is 45 degrees explain your answer, i really don't understand this.