Select the missing number from the given...

Select the missing number from the given responses in the following question .
`{:(5,5,2),(2,4,1),(8,3,10),(40,30,?):}`

A

10

B

12

C

13

D

20

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The correct Answer is:

A

`(8xx 5xx2)/(2) =40`
`(5xx4xx2)/(2) = 30`
Therefore,
? = `(2xx1xx10)/(2) = 10`

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