`{:(13,6" "4),(6,8" "6),(1,6" "?):}`

Options

A. 7
B. 10
C. 8
D. 13

Answer

B

Explanation

First Column
`13+6+1=20`
Second Column
`6+8+6=20`
Third Column
`4+6+?=20`
`rArr ?=20-10=10`