We can solve this problem by taking digit by digit. First and second digit,both are increased by 1,respectively 34…,45…,56…,67…,78…,89… Third and fourth are the multiplication of first and second digit 3 x 4 = 12 4 x 5 = 20 5 x 6 = 30 6 x 7 = 42 7 x 8 = 56 8 x 9 = 72 so now the series become 3412.,4520.,5630.,6742.,7856.,8972.
Last digit equivalent multiplying the third and fourth digit: 1 x 2 = 2 2 x 0 = 0 3 x 0 = 0 4 x 2 = 8 5 x 6 = 30 7 x 2 = 14
so now the series become 34122,45200,56300,67428,785630,897214
Answers & Comments
We can solve this problem by taking digit by digit.
First and second digit,both are increased by 1,respectively
34…,45…,56…,67…,78…,89…
Third and fourth are the multiplication of first and second digit
3 x 4 = 12
4 x 5 = 20
5 x 6 = 30
6 x 7 = 42
7 x 8 = 56
8 x 9 = 72
so now the series become
3412.,4520.,5630.,6742.,7856.,8972.
Last digit equivalent multiplying the third and fourth digit:
1 x 2 = 2
2 x 0 = 0
3 x 0 = 0
4 x 2 = 8
5 x 6 = 30
7 x 2 = 14
so now the series become
34122,45200,56300,67428,785630,897214