Question

9=90, 8=72,7=56,6=42,3=?​

Answer 1

12

9=90=9*10=9*(9+1)

8=72=8*7=8*(8+1)

let the no. be x

so we get x=x*(x+1)

taking x=3,

3=3*(3+1)

3=3*4

3=12

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