Select the number that can replace the question mark (?) in the following series.
13, 22, 33, 48, 69, ?
In this series double difference is applicable.
Let's assume 'y' in place of the question mark.
21+8 = y-69
29 = y-69
y = 69+29 = 98
hence 98 will come in place of the question mark.
Create a FREE account and get: