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How many 9 digit numbers are possible by using the digits 1,2,3,4,5 which are divisible by 4 if the repetition is allowed?
a) 5^7 b) 5^6 c) 5^9 d) 5^8

Read Solution (Total 1)

5^n-1 where n is no of 9 digit numbers

here n=9
5^9-1=5^8
13 years agoHelpfull: Yes(14) No(2)

TCS Other Question

In 80 coins one coin is counterfeit what is minimum number of weighing to find out counterfeit coin Ram singh goes to his office in the city every day from his suburban house. His driver Mangaram drops him at the railway station in the morning and picks him up in the evening. Every evening Ram singh reaches the station at 5 o'clock. Mangaram also reaches at the same time. One day Ram singh started early from his office and came to the station at 4 o'clock. Not wanting to wait for the car he starts walking home. Mangaram starts at normal time, picks him up on the way and takes him back house, half an hour early. How much time did Ram singh walked?