Quiz

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Answer :

ఎలా అంటే : 

3 (3 - 1) = 3 x 2 = 6, 

4 (4 - 1) = 4 x 3 = 12, 

5 (5 - 1) = 5 x 4 = 20, 

6 (6 - 1) = 6 x 5 = 30