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VOLUNTEER TRAINING FOR DISADVANTAGED IN MATHS – QUESTION 15 : A motel cleaner has 8 master keys at home to open all the rooms in a large motel. Each room can be opened by just 1 of these keys. If 40 % of the rooms are left unlocked, what is the probability that the cleaner can get into a specific room if he selects 3 keys at random before leaving home to go to work? (A) 5 / 8, (B) 5 / 16, (C) 31 / 40, (D) 3 / 20, (E) 19 / 40.
1 1890VOLUNTEER TRAINING FOR DISADVANTAGED IN MATHS – QUESTION 16 : A committee of 6 people is to be chosen from 8 students and 6 teachers so that it contains at least 3 students and at least 2 teachers. The number of ways this can be done is – (A) 1050, (B) 1120, (C) 7560, (D) 840, (E) 2170.
1 9057the perimetere of a square is 44m more than that of another and 187 sqm more in area then the side of the larger square is
1095The pipes can fill a cistern in 1.5 hours and 2 hours respectively. A wste pipe can empty a full cistern in 3 hours. If the cisternis empty and all three pipes are opened together, in how many min will the cistern be half full
1414the ages of two brothers are now in the ratio 4:3 but fifteen years ago, they were in the ratio 3:2the present age are
997if the price of orange falls by 20 % one can buy 5 dozens more for RS 300, then the original price per dozen is
1269P and Q are positive integers with their averagfe 15, find how many different values can one take
1066a spere circumscribes a cylinder . then the ratio of the surface area of the spere to the curved surface area of the cylinder is
1182Post New Mathematics Questions
find 31 - 29+2/33=__
briefly know about ur native place?
Simplify e(3!*5!*6!*3!=3110400)
if card punch operator can process 80 cards in half an hour how many cards can this process in 7hr 30min?
how to counting numbers of 3 same sides triangles that can be inserted into an a perfect right triangle?
What is the greatest common divisor for the numbers 102 and 30?
find 55/1000=___
What is the integral value of sec(square)x, with upper limit 180/4 and lower limit 0 ?
the value of x which makes xi+2j+3k and -i+5j+k perpendicular is
if x,y,z are natural numbers, and if 2x=y and y=3z, which of the following numbers could be x+y+z
The imaginary unit I is numerically defined as what?
find 200/7*5.04=
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Name any two contribution of Aryabhatta.
Under what condition the critical point (a,b) will be saddle point ?
