7.(5.4) how many ways are there: (1) to distribute eight distinct pencils to four boys? (2) to distribute 10 identical balls to 15 distinct boxes?

Two lines that do not intersect are skew. always sometimes or never

Abcd is a square. what is the measure of angle bac

A. the probability that a product is defective is 0.1. what is the probability that there will be 1 or less defective products out of the next 8 produced products b.the expected number of imperfections in the coating nylon for parachutes is 6 per 100 yards. what is the probability of finding 12 or fewer imperfections in 260 yards c.in a lot of 54 products there are 9 defective products. calculate the probability that not more than 1 is defective from a random sample of 17 products.