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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 not allowed?
a) 5^7
b) 5^6
c) 5^9
d) 5^8

Read Solution (Total 4)

Not Possible .How can we form the 9 digits number using five nos without repetition ? We can form only five digit numbers
14 years agoHelpfull: Yes(61) No(16)

ye kya BKC h????????
13 years agoHelpfull: Yes(21) No(7)
In order to be divisible by 4, the two least significant digits must be
12, 24, 32, 44, 52 (a total of 5 choices)
The other 6 digits can be any of the five allowed digits.
The total number of possible numbers is
(5^6)*(5) = 5^7 = 78125
12 years agoHelpfull: Yes(6) No(29)
The above is not possible when repetition is not allowed..
10 years agoHelpfull: Yes(1) No(1)

TCS Other Question

There is a die with 10 faces. It is not known that fair or not. 2 captains want to toss die for batting selection. What is the possible solution among the following?
a) If no. is odd it is head, if no. is even it is tail
b) If no. is odd it is tail, if no. is even it is head
c) Toss a die until all the 10 digits appear on top face. And if first no. in the sequence is odd then consider it as tail. If it is even consider it as head.
How many 13 digit numbers are possible by using the digits 1,2,3,4,5 which are divisible by 4 if repetition of digits is allowed?