MBA Exam

What is the value of the following expression?{1/(2^2-1}+{1/(4^2-1}+{1/(6^2-1}+.......+{1/(20^2-1}

1) 9/19
2) 10/19
3) 10/21
4) 11/21

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MBA Other Question
The roots of x^3 - p*x^2+q*x - r =0 are consecutive integers. If q has minimum posible value, which of the following must be true?

1) the sum of roots is 0
2) the product of roots is -1.
3) q = -1
4) exactly two of (1), (2) and (3).
5) , (2
 Find units digit : (173^45) x (152^77) x (777^999)

1) 2
2) 4
3) 6
4) 8