Show that any positive odd integer is of the form 8q+1 8q+3or 8q+5or 8q+7 where q is some integer
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let a be any positive integer
then
b=8
0≤r<b
0≤r<8
r=0,1,2,3,4,5,6,7
case 1.
r=0
a=bq+r
8q+0
8q
case 2.
r=1
a=bq+r
8q+1
case3.
r=2
a=bq+r
8q+2
case 4.
r=3
a=bq+r
8q+3
case 5.
r=4
a=bq+r
8q+4
case 6.
r=5
a=bq+r
8q+5
case7.
r=6
a=bq+r
8q+6
case 8
r=7
a=bq+r
8q+7
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