Question
A man can go on a motor boat with a speed of 25 km/hour
in still water to a certain upstream point and come back to the starting point in a river which flows at a speed of 15km/hour. Find the average speed of motor boat for total journey?Solution
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77, 101, 139, 197, 281, 413
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Find the wrong number in the given number series.
1, 8, 27, 65, 125, 2168137, 5405, 3669, 2701, 2201, 1997
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