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Show that any positive odd integer …

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Show that any positive odd integer is of the from 4q+1 or 4q+3 were q is some integer
  • 1 answers

Ankit Kumar 7 years, 6 months ago

suppose that a is any positive integer then it is divided by 4 then we get q as a quotient and r as a remainder then by euclid's division lemma we get that a=4q + r where 0<= 4<r then r= 0,1,2,3 when r = 0 then a=4q = 2*2q (let 2q = p) = 2p which is an even when r=1 then a= 4q+1 which is an odd when r= 2 then a= 4q+2 = 2(2q+1) (let 2q+1 = p) = 2p which is an even when r=3 then a= 4q+3 = 4q+2+1 = 2(2q+1) +1 (let 2q+1 =p) = 2p+1 which is an odd. hence, we can say that every positive integer is of the form 4q+1 or 4q+3. proved.
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