a+b+c=15a'+b'+c'=12 ; ways=14c2We have to omit cases in which any one of them is greater than 6a+b+c=5; ways=3(7c2)T'=14c2-3(7c2)=28For favourableb+c = 11b'+c'=9 ways=10-6(omit>6)=84 can be in any 3 so favourable=12P(E)=12/28 = 3/7?
One more sitter A mutual fund allows new investors to open accounts or existing investors to deposit money in their accounts only at the beginning of the year. It credits interest at the end of the year on the balance (B) at the beginning of the year. If B is not more than र25000, the rate of interest is 10% p.a., otherwise it is 15%.If a man deposits र10000, र12000 and र15000 at the beginning of the first, second and third years, what is the worth of his deposits at the end of three years?
12. The normal rate of infection of a certain disease in animals is known to be 40%. In an experiment with 6 animals injected with a new vaccine it was observed that none of the animals caught the infection. Calculate the probability of the observed result if the vaccine was ineffective.
Vijay bhai... 6 kaise observe kiya? One more doubt .. if numbers in some base system are in A.P. , then will they also be in A.P. in base 10?
You can take 5 also. I saw that there are 4 different digits. (1, 2, 4, 5) I went with 6 and it worked :mg:
Yes they have to be in A.P. Common difference will be same. (we are deducting a constant number while changing the base. i.e. 1 in base 9, 2 in base 8 and so on)
12. The normal rate of infection of a certain disease in animals is known to be 40%. In an experiment with 6 animals injected with a new vaccine it was observed that none of the animals caught the infection. Calculate the probability of the observed result if the vaccine was ineffective.
9. Assuming that ˝ of the population is vegetarian, 100 investigators take a sample of 10 individuals to whether they are vegetarians. How many investigators would you expect to report 3 or less vegetarians?
12. The normal rate of infection of a certain disease in animals is known to be 40%. In an experiment with 6 animals injected with a new vaccine it was observed that none of the animals caught the infection. Calculate the probability of the observed result if the vaccine was ineffective.
9. Assuming that ˝ of the population is vegetarian, 100 investigators take a sample of 10 individuals to whether they are vegetarians. How many investigators would you expect to report 3 or less vegetarians?
I think bold underlined word should be numbersabc, a can be 1, 6, 7, 8, 9b can be 0, 1, 6, 7, 8, 9c can be 0, 1, 6, 7, 8, 9So, 5*6*6 = 180 such numbersA man is known to speak truth 3 out of 4 times. He throws a die and reports that it is a six. Find the probability that it is actually a six.a) 3/4b) 3/8c) 1/2d) 2/3
11. In a bombing attack there is 50% chance that anyone bomb will strike the target. Two direct hits are required to destroy the target. How many bombs must be dropped to give a 99% chance or better of completely destroying the target.
A watch, which gains time uniformly, was 5 minutes behind the correct time when it showed 11:55 AM on Monday.It was 10 minutes ahead of the correct time when it showed 06:10 PM on the next day. When did the watch show the correct time?
A watch, which gains time uniformly, was 5 minutes behind the correct time when it showed 11:55 AM on Monday.It was 10 minutes ahead of the correct time when it showed 06:10 PM on the next day. When did the watch show the correct time?
A watch, which gains time uniformly, was 5 minutes behind the correct time when it showed 11:55 AM on Monday.It was 10 minutes ahead of the correct time when it showed 06:10 PM on the next day. When did the watch show the correct time?
at 10 PM Monday ?(edited, previously 6 PM Monday, because my great brain calculated 600 minutes to be 6 hours 😛 )
A watch, which gains time uniformly, was 5 minutes behind the correct time when it showed 11:55 AM on Monday.It was 10 minutes ahead of the correct time when it showed 06:10 PM on the next day. When did the watch show the correct time?