MBA Exam

The number 523abc is divisible by 7,8 and 9. Then abc is?With explanation of course..

1) 180
2) 10
3) 120
4) 240

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MBA Other Question

If the roots of the equation x2 + 7x + 8 = 0 are in the ratio p : q (p > 0, q > 0), then the value of root(p/q) + root(q/p)?Bit confused with this one..please explain.

1) 7*root2/4
2) -7*root2/4
3) 7/4
4) cannot be determined
How many 6 digit numbers can be formed using 1 to 6 without repetition, such that number will be divisible to its unit place digitNeed help

1) 402
2) 528
3) 648
4) 720