Riddles Brain Teaser Of The Day: Find The Missing Number February 19, 2018December 2, 2017 gags Can you find the missing number in the sequence given below? 11 15 19 12 16 ? 13 17 21 14 18 22 Show answer The sequence is given in the puzzle is: 11 15 19 12 16 ? 13 17 21 14 18 22 Let’s break the given series as below: 11 15 19 12 16 ? 13 17 21 14 18 22 Now read the number from the left-hand side from top to bottom.