1. First, write each sentence below using quantifiers ∀, ∃. Then, negate and simplify your expression.
(a). Every rational number has a natural number that is less than its square.
(b). All positive real numbers can be written as the difference of two irrational numbers.
(c). Between any two distinct real numbers, there is a rational number with an odd numerator.
(d). If p is a positive integer and not a multiple of 2, then p can be expressed as the sum of a pair of consecutive integers.