MBA Exam

How many two digit numbers exist such that the sum of the digits of the number is ‘a’ times the difference of the units digit over the ten’s digit, where ‘a’ is a positive single digit number.

1) 16
2) 12
3) 14
4) 32

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MBA Other Question
if (ab)^2=ccb >300 where a,b,c are distinct digits then b is

1) 1
2) 0
3) 5
4) 6
 Twelve students are made to stand in a row. The class teacher has to select three students from these 12 students such that there are at least 3 students standing between any two of the three students selected. In how many ways can this be done?

1) 10
2) 24
3) 16
4) 20