Since 17 is a prime number - the only two numbers that will divide into it exactly are 1 & 17 !
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The factors of 68 are: 1, 2, 4, 17, 34, 68.
7 and 17 are two numbers
Apart from itself and 1, the only numbers that divide evenly into 221 are 13 and 17. Therefore, 221 = 13 x 17.
Nothing can go evenly into 21 or 17. They are both odd numbers and therefore cannot be evenly divided.
No, as 7 does not divide evenly into 17. (Also 17 is prime.)