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How many two-digit numbers are there such that the two digits differ by exactly two?

 Jan 27, 2021
 #1
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+2

Two-digit number ab: a = b + 2

20, 31, 42, ..., 97 ==> 8 numbers

b = a + 2, 8 numbers

 

8 + 8 = 16 numbers

 Jan 28, 2021
 #2
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+1

8 numbers

 Jan 30, 2021

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