17. Is x + y - Z + t even ?
I.
x + y + t is even.
II. t and z are odd.
Answers
Answered by
4
Answer:
Use the rules that
(a) product of two odd or even numbers are odd and even respectively.
(b) the quotient of the odd number ÷ even number or vice-versa may or may not be strictly odd or even.
a. ab must be a even number and
c
ab
may be even number or a fraction or odd number and xy must be a odd number
therefore it can be justified in some case.
b.
x
ab
is always a fraction or even number and yz is always a odd number
therefore it cannot be justified in any case
c.
z
xy
maybe odd number or fraction but ab will always be even.
therefore it cannot be justified.
Relationships given in b and c can't be justified at any cost.
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