Prove the following: Let a and b be any integers. If n is an odd integer the n2 is an odd integer. Solution The general from of an odd nuber is 2n+1 Where n is an integer. Let 2a+1 and 2b+1 are two odd integers Where a and b belongs to z TTheir product =(2a+1)(2b+1) =2a (2b+1)+2b+1 =4ab+2a+2b+1 =2(2ab+a+b)+1 n2=2×integer+1 n2 =an odd integer.