2+4+6=19

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2 + 4 + 6 = 19  ====> 2*4 + 2*6 - 1 = 8 + 12 - 1 = 19
3 + 6 + 9 = 43  ====> 3*6 + 3*9 - 2 = 18 + 27 - 2 = 43
4 + 6 + 8 = 53  ====> 4*6 + 4*8 - 3 = 24 + 32 - 3 = 53
9 + 5 + 3 = 53  ====> 9*5 + 9*3 - 4 = 45 + 27 - 4 = 68
Another answer
(4 + 6) * 2 - 2 + 1 = 19
(6 + 9) * 3 - 3 + 1 = 43
(6 + 8) * 4 - 4 + 1 = 53
Then
(5 + 3) * 9 - 9 + 1 = 64
The answer is 64
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