A coin with p(head)=0.6 is tossed twice.What is the probability that at least one head occurs?
In the reading room of a library, there are23 reading spots. Each reading spot consists of a round table with 9 chairs placed around it. There are some readers such that in each occupied reading spot there are different numbers of readers. If in all there are 36 readers, how many reading spots do not have even a single reader?
Two computers each produced 48000 public utility bills in a day. One computer printed bills at the rate of 9600 an hour and the other at the rate of 7800 an hour. When the first computer finished its run, how many bills did the other computer still have to print?
It takes five minutes to pass a rumor from one person to two other persons. The tree of rumor continues. Find how many minutes does it take spread the rumor to 768 persons.
How many 3-digit numbers with atleast one 5 in their digits?
Q2. Pipe A takes 16 min to fill a tank. Pipes B and C, whose cross-sectional circumferences are in the ratio 2:3, fill another tank twice as big as the first. If A has a cross-sectional circumference that is one-third of C, how long will it take for B and C to fill the second tank? (Assume the rate at which water flows through a unit cross-sectional area is same for all the three pipes.)
Which is the biggest perfect square amongst the following 15129, 12348, 23716, 20736
If a and b are positive integers and (a-b)/3.5 = 4/7, then the relation between a and b is
Why we declare in the way List ab = new ArrayList(); what is the use of it?
Argentina had football team of 22 player of which captain is from Brazilian team and goalki from European team. For remainig palayer they have picked 6 from argentinan and 14 from european. Now for a team of 11 they must have goalki and captain so out of 9 now they plan to select 3 from rgentinian and 6 from European. Find out no. of methods avilable for it.
Alok and Bhanu play the following min-max game. Given the expression N = X - Y - Z where X, Y and Z are variables representing single digits (0 to 9), Alok would like to maximize N while Bhanu would like to minimize it. Towards this end, Alok chooses a single digit number and Bhanu substitutes this for a variable of her choice (X, Y or Z). Alok then chooses the next value and Bhanu, the variable to substitute the value. Finally Alok proposes the value for the remaining variable. Assuming both play to their optimal strategies, the value of N at the end of the game would be
Find the next number in the series 12,21,,112,121,122---
What is the value of 12x-3x-7 when x =-5?