MBA Exam

When 1 is added to the product of two prime numbers, it becomes a perfect square how many such pairs of prime numbers are possible?Lets speak frequently used facts of Number System ?

1) 12
2) 5
3) 7
4) 8

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MBA Other Question

Consider four digit numbers for which the first two digits are
equal and the last two digits are also equal. How many such numbers are
perfect squares?

1) 2
2) 4
3) 0
4) 1
5) 3
(10^10+10^10^2+10^10^3+10^10^4+10^10^5+10^10^6+10^10^7+10^10^8+10^10^9+10^10^10)/7 what will be reminder??

1) 1
2) 4
3) 5
4) none of this