In a class of 50 pupils, it was found that 4 take maths and Bio only,3 take maths and Chem only and 6 take Bio and Chem only. Furthermore, 7 take maths alone, 5 take Bio alone and 8 take chem alone. If 2 take non of the above subjects, find : a) the number of pupils doing all the 3 subjects (3mks) ; b)the number of pupils taking maths and chem.(3mks)

Four airplanes carrying a total of 400 passengersarrive at the detroit airport. the airplanes carry, respectively,50, 80, 110, and 160 passengers.a) one of the 400 passengers is selected uniformly at random.let x denote the number of passengers that were on theairplane carrying the randomly selected passenger. find var(x)for x as given in the problemb) one of the 4 airplane drivers is also selected uniformly atrandom. let y denote the number of passengers on the chosen driver’s airplane. find var(y) for y as given in the problem

Which of these sequences is a geometric sequence a 1,2,4, 7, 11, 16, 22. b. 2.4.8.14.22.38 c.3.6.9. 15.18,21 d. 3,9,27,81,243,729,

The measurement of one angle of a right triangle is 42° what is the measurement of the third angle? (there is no picture)