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79, 109, 139, 1_9, 199, 229 79, \; 109, \; 139, \; 1\text{\_}9, \; 199, \; 229 79,109,139,1_9,199,229
The above are 6 distinct prime numbers arranged in increasing order. One of the numbers is missing its tens digit.
Which of the following can be the missing digit?
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