Suppose a, b, c, and d are integers. Prove that
(a) 2a − 1 is odd.
(b) if a is even, then a + 2 is odd.
(c) if a is odd, then a + 2 is odd.
(d) a(a + 1) is even.
(e) 1 divides a.
(f) a divides a.
(g) if a and b are positive and a divides b, then a ≤ b.
(h) if a divides b, then a divides bc.
(i) if a and b are positive and ab = 1, then a = b = 1.
(j) if a and b are positive, a divides b and b divides a, then a = b .
(k) if a divides b and c divides d, then ac divides bd.
(l) if ab divides c, then a divides c.
(m) if ac divides bc, then a divides b.
We need at least 10 more requests to produce the solution.
0 / 10 have requested this problem solution
The more requests, the faster the answer.