what is the probability that a randomly selected permutation of the letters a, a, c, c, l, l, o, r, t, u would spell “calculator”?

Airline passengers arrive randomly and independently at the passenger-screening facility at a major international airport. the mean arrival rate is 10 passengers per minutes. compute the following probabilities. p(x = 4) p(x > 11)

Mat bought a phone for $100. he has to pay $30 per mouth. if he has paid $640 in total, how many mouth has he had the phone?

Plz hurry evaluate the expression a+b where a=8 and b=19