# Find the next number in the series?

Find the value of 'a' and 'b' in the following series.

100,101,120,103,410,321,205,404,60a,5b2

• may be a = 3 , b=3 – Saurabh Prajapati Apr 24 '15 at 11:42

Sum of all digits in every number is growing.

Number     digits SUM
---------------------
100        1
101        2
120        3
103        4
410        5
321        6
205        7
404        8
60a        it should be 9       so "a" = 9-6 = 3
5b2        it should be 10      so "b" = 10-5-2 = 3