Question Number: #Com8456

The integers 1,2.......40 are written on a blackboard The following operations then repeated 39 times:  In each repetition any two numbers say a and b  current y on the blackboard are erased and a new number a + b – 1  s written. What will be the number eft on the board at the end?

A.) 820
B.) 821
C.) 781
D.) 780

Answer is option : C

Question Related Topics:
Quantitative Ability
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