`{:(5,5,2),(2,4,1),(40,30,?):}`

Options

A. 10
B. 12
C. 13
D. 20

Answer

A

Explanation

`{:(5,5,2),(2,4,1),(8,3,10),(40,30,?):}`
`40 = (8 xx 5 xx 2)/(2)`
`30 = (5xx 4 xx3 )/(2)`
`:. ? = (10 xx 2 xx 1)/(2) = 10`