100 Balls in NETS

A bag contains black balls and some white balls. If the probability of drawing a black ball is 0.5 , then find the number of white balls in the bag. There are total 100 balls in the bag

Find the number of ways in which a selection of 100 balls,can be made out of 100 identical red balls,100 identical blue balls &100 identical white balls.

A bag contains 100 balls numbered from 1 to 100. Four balls are removed at random without replacement.The probability that the number on the last ball is smaller than the number on first ball,is equal to (A) (1)/(4) (B) (3)/(4) (C) (2)/(5) (D) (1)/(2)

A ball is projected vertically up wards with a velocity of 100 m/s. Find the speed of the ball at half the maximum height. (g=10 m//s^(2))

At t = 0 a 100gm ball is thrown upwards with initial speed v_(0) = 2 m/s in an open platform elevator which at that time is moving downward with v = 3 m/s and accelerating downward with an acceleration, a = 3 m//s^(2) ​. A drag force with magnitude F_"​DRAG" = 0.8 N acts on the ball. Net force acting on the ball in the frame of the elevator just after it has been thrown is [ g =10 m//^(2) ​] :

Calcualte the wavelength of matter wave associated with small ball of mass of 100g travelling at a velocity of 35ms^(-1)

What is the work done In joules if a 100-kg ball is raised to 3 m above the floor in 1 second ?

a shopkeeper buys 100 balls rs 10000 and sells 40 of them at a profit of 12.5% .at what percent should he sells the remaining balls so that overall profit is 20% ?