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10 February, 21:31

2+3=8,

3+7=27,

4+5=32,

5+8=60,

6+7=72,

7+8=?

+5
Answers (1)
  1. 11 February, 00:34
    0
    98

    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
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