MBA Exam

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

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MBA Other Question

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
A,B & C had to paint 3 similar fences. On1st day A turned up for work and complted work on 1st fence in 'm' hrs. On 2nd day,all 3 turned up for work and completed work on 2nd fence in 'm-4' hrs. On 3rd day B&C; turned up for work and completed work on 3rd fence in 'm+5' hrs. Find 'm'

1) 8
2) 9
3) 6
4) 10
5) Cannot be determined