MBA Exam

If 'a' is one of the roots of x^5-1=0 and a=!1,then what is the value of a^15+a^16+a^17...+a^50??share ur approach

1) 1
2) 5a
3) 35
4) none of these

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MBA Other Question

What annual installment will discharge a debt of Rs.1815 due in 3 months at 10% Simple Ineterest?

1) 500
2) 520
3) 550
4) 580
The integers 1, 2, …, 40 are written on a blackboard. The following operation is then repeated 39 times: In each repetition, any two numbers, say a and b, currently on the blackboard are erased and a new number a + b – 1 is written. What will be the number left on the board at the end?

1) 820
2) 821
3) 780
4) 819
5) 781