In the following number series, two numbers have been put within brackets. Select the most appropriate option for these numbers in relation to their inclusion in the series.
21, 24, 19, (29), 17, 28, (15), 30
Show answer & explanation
Correct answer: C
Explanation
The correct answer is option 3 i.e. The first bracketed number (from the left) is incorrect and the second bracketed number (from the left) is correct.
Given series: 21, 24, 19, (29), 17, 28, (15), 30
Logic: Starting from the first number from the left side, 2 is subtracted to obtain the numbers at alternate places. Starting from the second number from the left side, 2 is added to obtain the numbers at alternate places.
21 - 2 = 19; 19 - 2 = 17; 17 - 2 = 15, thus 15 is correct.
24 + 2 = 26; 26 + 2 = 28; 28 + 2 = 30, thus 29 is incorrect