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Answer:
21
Step-by-step explanation:
Multiples of 7: 7, 14, 21, 28, 35, 42, 49...
Factors of 42: 1, 2, 3, 6, 7, 14, 21, and 42.
21 is the answer since it is a 2-digit odd number, a multiple of 7 and a factor of 42.