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Sagot :
Answer:
1
Step-by-step explanation:
9 can't be the answer because 39 is not a prime number
3 can't be the answer because 33 is not a prime number
5 can't be the answer because 75, 35 and 15 are not prime numbers
1 is the answer because 71, 31 and 11 are all prime numbers
hope this helped!!
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