Question

use euclid lemma 6q+1 or 6q+3 or 6q+5

Answer 1

according to euclid's lemma:
               a=6q+r,   0<-r<6
               a=6q ,6q+1,6q+2',6q+3,6q+4,6q+5
but 6q,6q+2,6q+4  even  +ive integers.
6q+1,6q+3+6q+5  are odd integers

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