MBA Exam

a,b,c and d are positive numbers such that b^9 = a^8, c^6 = d^7 and d-b = 473, then find c-a

1) 1675
2) 1565
3) 1735
4) Cannot be determined

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MBA Other Question
a, b, and c are the lengths of the three sides of a scalene triangle. The quadratic equation, 3(a + b + c)x2 + 5 a2x + 2 a2k2 (a + b + c) = 0 has distinct and real roots. Which of the following is a possible value of k ?

1) 0
2) 1
3) +½
4) None of these
5) More than one value
 Find the 10s digit of 1! + 2! + 3!.....30! Please share the approach as well ....

1) 1
2) 2
3) 5
4) None of these