`{:(9,3,7),(12,2,9),(13,5,?),(1404,30,504):}`

Options

A. 5
B. 8
C. 15
D. 56

Answer

B

Explanation

`9 xx 12 xx 13 = 1404`
`3 xx 2 xx 5 = 30`
`7 xx 9 xx ? = 42`
`:. ? = (504)/(7 xx 9) = 8`