MBA Exam

The integers 1, 2, â€¦, 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 â€“ 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

Read Solution (Total 1)

781

If the statement is
n each repetition, any two numbers, say a and b, currently on the blackboard are erased and a new number '(a + b - 1)' is written

final number will be (1+2+3+..40)-39= 781
11 years agoHelpfull: Yes(2) No(0)

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