Page 19; Subtracting 1024 from item 5 is a multiple of 3, and 1708 is divisible by 5 by adding at least 2. Question 6 is a prime number with two digits. The two digits obtained by exchanging the digits in the unit with the digits in the tenth place are still prime numbers. This two-digit number may be 3 1, 7 1/79, which is true or false. Choose from ×, ×, √, ×, √, ×; C, B, A, B, B