MBA Exam

the sum as well as the product of a quadratic equation is 8, then the quadratic equation is :

1) x^2+4=0
2) x^2-4=0
3) x^2+4x+4=0
4) x^2-8x+8=0
5) x^2-4x-4=0

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MBA Other Question

There are 3 identical sets of 5 weights each. Using one or more of these weights and a common balance one can measure any integral weight (in gm) from 1 gm to N gm. What is the maximum possible value of N?Approach Plz

1) 1023
2) 363
3) 8403
4) 8979
I kno its easy but still nt getting ans Two boxes,1 box containts 2 black ball and 2 white balls,2nd box contains 4 black and 12 white balls.If a box is choosen randomly and two balls are drawn at randomly from it,what is the probability of atleast one ball being black.?

1) 11/20
2) 43/120
3) 77/120
4) 9/20