In the following question, select the number which can be placed at the sign of question mark(?) from the given alternatives.
14
15
17
19
B.
15
As,
2 + 3 = 5, 5 + 4 = 9, 9 + 5 = 14
7 + 3 = 10, 10 + 4 = 14, 14 + 5 = 19
Similarly,
8 + 3 = 11, 11 + 4 = 15, 15 + 5 = 20