There are 1000 doors that are of the open-close type. When a person opens the door he closes it and then opens the other. When the first person goes he opens-closes the doors ion the multiples of 1 i.e., he opens and closes all the doors. When the second goes he opens and closes the doors 2, 4 6 8 rely. Similarly when the third one goes he does this for 3 6 9 12 15th doors rely. Find number of doors that are open at last.
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in a railway station, there are tow trains going. One in the harbour line and one in the main line, each having a frequency of 10 minutes. the main line service starts at 5 o'clock. the harbour line starts at 5.02a.m. a man goes to the station every day to catch the first train. what is the probability of man catching the first train
The sum of the two numbers is 45 & difference of 2 numbers is 675. Find the number ?
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In a club there are male and female members. If 15 female quit then the number of males will become double the number of males. If 45 males quit no. of female becomes five times the number of males. Find the number of females.
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There are following denominations of money: 1, 2, 5, 10, 20, 50, and 100 paise. Alex has as twice mony as David, who has as twice as Bindya, who again has as twice money as Charles. Each has two coins in hand. Which coins Bindya has?
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if f(x)=1/x**2 , then f(f(f(x)))