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A math problem: among all four digits, how many digits have a sum or product equal to 7?
Of all the four digits, the sum or product of 88 digits is equal to 7.

1*7=7: 1 17, 1 17 1 17 1 165438+.

1+6=7 6

2+5=7 6

3+4=7 6

1+ 1+5=7 are:1010510511/kloc-0.

2+2+3=7 9

3+3+ 1=7 9

1+2+4=7 are:10241204124014021420 2014 204/kloc-.

240 1 24 10 40 12 402 1 4 102 4 120 420 1 42 10 18.

1+ 1+2+3=7: 1 1 132 12 13 123 12365438.

3 1 12 3 12 1 32 1 1 12.

1+ 1+ 1+4=7: 1 14 1 14 14 165438.

2+2+2+ 1=7 is: 4.

7+0=7: 7000 1.

4+6+6+6+9+9+ 18+ 12+4+ 1 = 88