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The sequence is: 9, 3, 6, 6, 3, 9, 5, 9, 3, 7, 8, 9, 1, 6, 3, 9, 6, 3, 9 We need to count the 3's that are neither preceded by 6 nor immediately followed by 9. The occurrences of 3 in the sequence are at positions: • 1st position: Preceded by 9 (not counted). • 3rd position: Preceded by 6 (not counted). • 5th position: Preceded by 6, followed by 9 (not counted). • 9th position: Preceded by 9, followed by 7 (counted). • 13th position: Preceded by 1, followed by 6 (counted). Thus, there are two 3's that meet the condition. Therefore, the correct answer is (c), Two.
A man can row 25/2 km an hour in still water and he finds that it takes him thrice as long as long to row down the river. The rate of stream is:
Speed of boat is 15 km/hr. Speed of the stream is 20% less than speed of boat. Then find time taken by boat to go 108 km downstream?
Find the total distance covered by boat in still water in 8 hours if the speed of boat in upstream and in downstream is 10 km/h and 15 km/h respectively?
A boat can cover 180 km in downstream in 18 hours and 125 km in upstream in 5 hours. Find the distance travelled by the boat in still water in 10 hours.
