maths teaser
Level
pending
2+3=8, 3+7=27, 4+5=32, 5+8=60, 6+7=72, 7+8=?? solve it?
The answer is 98.
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1 solution
2+3=2 [3+(2-1)]=8 3+7=3 [7+(3-1)]=27 4+5=4 [5+(4-1)]=32 5+8=5 [8+(5-1)]=60 6+7=6 [7+(6-1)]=72 therefore 7+8=7 [8+(7-1)]=98 x+y=x[y+(x-1)]=x^2+xy-x