The integer 1,2,.......40 are written on a blackboard the following op – McqOptions

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1.	The integer 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?
A.	820
B.	821
C.	781
D.	819
Answer» D. 819

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