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How many mod 3 counters are required to construct mod 9 counter.
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Three cards are drawn at random from an ordinary pack of cards. Find the probability that they will consist of a king, a queen and an ace.
Two pipes A and B when working alone can fill a tank in 36 minutes and 45 minutes respectively. A waste pipe C can empty the tank in 30 minutes.First A and B are opened After 7 minutes. C is also opened . In How much time will the tank be full ?
X and Y live in a North-South parallel street. X travels 10 km towards North to reach the east-west street . Y travels 6 km towards south to reach the east ?west street . X travels now 4km towards east and y travels 8km towards west and they met each other. What is the distance between x and y?
6. x% of y is y% of ? (A) x/y (B) 2y (C) x (D) can't be determined
There are 5 red shoes, 4 green shoes. If one draws randomly a shoe what is the probability of getting red shoe is ?
a=2,b=3,c=6 c/(a+b)-(a+b)/c=?
The speed of a motor boat in still water is 15 km/hr and the rate of current is 3 km/hr. What is the distance travelled downstream in 12 minutes?
a person went to a shop and asked for change for 1.15paise. but he said that he could not only give change for one rupee. but also for 50p,25p,10p and 5p. what were the coins he had
salary of a person increases every year by 20%. his salary in the year 2001 was Rs. 26,640. what was salary in 1999? well i am confused. suggest how to do such probs in steps.
C1,C2 upto Cn are n cities in a country.There are some roads connecting these cities.They are connected in such a that Crth city has r distinct routes connecting each of the other city in the country. 1)if n=27,then how many roads are there in a country? 2)if n=4,in how many distinct routes,can a person travel from c3 to c2?
5. A person, who decided to go to weekened trip should not exceed 8 hours driving in a day. Average speed of forward journey is 40 m/h. Due to traffic in sundays, the return journey average speed is 30 m/h. How far he can select a picnic spot?
1/(10 power 18) - 1/(10 power 20) = ?
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