MBA Exam

If a is single digit number and a^n-a is divisible by 10,where n is any natural number,how many values can a take?

1) 2
2) 3
3) 4
4) none

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MBA Other Question

a coin is tossed twice if the coin shows head it is tossed again but if it shows a tail then a die is tossed. if 8 possible outcomes are equally likely.find the probability that the die shows a no. greater than 4,if it is known that the first throw of the coin results in a tail.

1) 1/3
2) 2/3
3) 2/5
4) 4/15
What is the sum of all odd number less than 1000 that can be formed using the digits 0, 1, 2, 3 and 4 repetitions being allowed?

1) 2666640
2) 2599980
3) 7109
4) 11100