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Probability of getting a head =0.6 =6/10=3/5 Probability of getting not head=1-3/5 =2/5 Direct shortcut- n Cr(P)r(1-P) n-r Then now Probability= =10C3 (3/5)3(2/5)7 = [(10×9×8)/3×2] × (33×27)/510 = (34×210)/59
A man can row one quarters of a kilometer against the stream in 30/4 minutes and return in 5/2 minutes. The speed of the man in still water is:
The speed of a boat in still water is 28 km/hr. If the boat covers 140 km in upstream in 7 hours, then find the time taken by the boat to travel 180 km ...
A boat goes 40km upstream in 8 hours and 36km downstream in 6 hours. The speed of the boat in still water.
Ricky can go on a motor boat with a speed of 15 km/hour in still water to a certain upstream point and come back to the starting point in a river which ...
Boat ‘A’ can cover 100 km in still water in 10 hours. In still water, if the ratio of the speed of boat ‘A’ to that of ‘B’ is 2:3 and the sp...
The ratio of speed of boat in upstream and in Stillwater is 1: 3 respectively. The boat takes a total of 10 hours to travel 300 kilometer in downstream ...
A boat covers some distance downstream in 1 hour. It covers 3/2 hours. If the velocity of the stream is 3 kilometers per hour, then what will be the vel...
Nobita can row from a point A against a current for 30 minutes and then come back in favour of the current for the next 30 minutes and comes to the poin...
A boat can cover 185 km in downstream in 5 hours and 120 km in upstream in 12 hours. Find the speed of boat in still water.
Speed of a boat in still water to speed of boat in upstream is 11: 9. If the boat can travel 260 km in downstream in 10 hours, then find the time taken ...
