Acomputer password uses 5 letters where no letter may be repeated. how many passwords are possible? a) 26! /5! b) 26! /21! c) 21! /5!

If a fair 6 sided cube is rolled 60 times, theoretically how many times should you expect to roll a 4 or a 5?

Planning for the possibility that your home might get struck by lighting and catch on fire is part of a plan for ?

What is the probability of throwing several dice with sum equal to 6 (six)? show the ways of possibilities for sum 6 (as the numerator) and the ways of throwing n dices for n = 1, 2, 3, 4 or 5 as denominator for all the questions to earn full credits. (a)throw one die, (b) throw two dice, (c) throw three dice (d) throw 4 dice, (e) throw 5 dice