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Let the numbers be 13m and 13n.
13m x 13n = 13 x 455 = 13 x 13 x 35
Or mn = 35
The co-prime numbers whose product is 35 are (5,7) and (1,35)
Hence, the no.s are 13 x 5 and 13 x 7 or 13 x 1 and 13 x 35
Or 65 and 91 or 13 and 455
Given that, one them lies between 60 and 70 ie 65,
Then the other number is 91 which lies between 90 and 100
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