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2*3=6 3*4=12 similarly 9*10=90
The answer is 90.
And i used to solve this is a*(a+1)
1 = 2 2 = 6 3 = 12 4 = 20 5 = 30 6 = 42 7 = 56 8 = 72 than 9 = 90
On behalf of Sture Sjöstedt
If:
2=6 3=12 4=20 5=30 6=42
Then
9= ??