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Let a be any +ve integer and let b be 9
by euclids lemma
a=bq+r and r is greater than equal to 0 and less than b so here ;a=9q or 9q+1or 9q+2 or .........9q+8
now (9q)^3 =729q ^3 = 9m form where m =81q^3
similiarly cube all to get forms of 9m+1 and 9m+ 8
0 0 0
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