puzzle

[Riyaz]

Solve this ... you can.. All the Best !!!!

 

2

3

4

15

12

3

4

5

28

20

4

5

6

45

30

5

6

7

66

42

6

7

8

?

56

 

The one who solves the problem can write the name in the attached file.  The answer is the password to open the file attached. 

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Thanks & Regards
        Riyaz