Study the given pattern carefully and select the number that can replace the question mark (?) in it.

Correct option is D

Logic: Row 1st + Row 3rd – Row 2nd = Row 4th
12 + 26 – 8 = 30
And
51 + 12 – 13 = 50
Similarly,
18 + 12 - ? = 23
30 - ? = 23
? = 30 – 23
? = 7
Correct answer is (d) 7