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mylen [45]
3 years ago
13

P and q are different two-digit prime numbers with the same digits, but in reversed order. what is the value of the larger of p

and q?
Mathematics
2 answers:
serious [3.7K]3 years ago
8 0
The set of two-digit primes is {11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, 97}

Of that list, the following primes are mirror images of each other
13 and 31
17 and 71
37 and 73
79 and 97
Note: we ignore 11 since 11 flips to 11 which is not distinct from its original

If you're looking for the largest prime of this form, then its 97
If you're looking for the largest gap, then subtract each pair
31-13 = 18
71-17 = 54
73-37 = 36
97-79 = 18
We see that 71 and 17 have the largest gap
Elina [12.6K]3 years ago
7 0
The digits cannot be 2, 4, 6, 5, 8, because those numbers in the one's place do not make a prime number.
of the numbers 1, 3, 7, 9, and largest is 97, and 79 is also a prime number, so the answer is 97
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