Engineering
Mathematics
Special Types of Sequence
Summation of Series
Arithmetic Progression and Its Properties
Question
Which pair of numbers comes next?
10,18,12,21,15,25,......
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Solution
This is an alternating addition series
First series = 10,10 + 2 = 12,12 + 3 = 15. ∴ next number= 15 + 4 = 19
Second series = 18,18 + 3 = 21,21 + 4 = 25 ∴ next number = 25 + 5 = 30
The next pair of numbers are 19,30.
Second series = 18,18 + 3 = 21,21 + 4 = 25 ∴ next number = 25 + 5 = 30
The next pair of numbers are 19,30.