The average (arithemetic mean) of a set ...

The average (arithemetic mean) of a set of seven numbers is 81. If one of the numbers is discarded, the average of the remaining number is 78. What is the value of the number that was discarded?

A

`98`

B

`99`

C

`100`

D

`101`

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The correct Answer is:

B

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