To find this out, simply take multiples of 8 and subtract 1 from them. The first five are:
8 x 1 - 1 = 7
8 x 2 - 1 = 15
8 x 3 - 1 = 23
8 x 4 - 1 = 31
8 x 5 - 1 = 39
The list continues on.
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23 is an odd number between 10 and 30 that gives a remainder of 2 when divided by 7.
An even number can be divided by 2 evenly. An odd number will have a remainder of 1 when divided by 2. 2, 4, 6 are even. 3, 5, 7 are odd.
Numbers ending in 1, 3, 5, 7 or 9 are considered odd numbers.
209
the remainder of the given number when divided by 7