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(1) a-c-b=even, so either all even or there are 2 odds and in either case the subtraction is same as addition, so addition must be even
SUFF
(2) (a-c)b=odd, for odd result in multiplication, both factors must be odd..., so here (a-c)=odd and b must be odd, because there is no evens in multiplication with odd oucome... however, (a-c)...either a or c could be odd, so we will get o+o+e, which makes outcome even...
SUFF
mandy,
If it does not say numbers must be integers, then yes, you can try using decimals or fractions.
Anyway,
I am getting (C)
ST1. A-C-B is even, or A-C-B=2k
If we choose A,B,C all integers and even, then A+B+C is even
However, if we use fractions, it does A+B+C does not have to be even
Let's see: A=2.2, B=0.1, C=0.1 and A-B-C=2 even. But A+B+C is not
ST2. (A-C)*B is odd
It follows that either
(1) A-C is even and B is odd
or (2) A-C is odd and B is even
or (3) A-C is a fraction and B is integer such that (A-C)*B=odd
or (4) A-C is integer and B is a fraction such that (A-C)*B=odd
Not sufficient.
Now, combine ST1 and ST2.
Neither A-C nor B can be fractions, otherwise ST1 is not valid.
So, all numbers -- A, B, and C -- must be integers.
Moreover, either 1 or all 3 must be odd (otherwise ST2 is violated.)
THANKS FOR yours answers but i thought that even number have to be integer
becaause even is an integer when divided by 2
oa will come _________________
consider AD/BCE,
A---
let A be 5.1,C be 2.1,A be 1
A-B-C=5.1-1-2.1=2(even)
but A+B+C=8.2 not even...
but if A is 6,B is 1 C is 3 both stmts are even hence A and D goes out
now consider B,
noe (5.1-2.1)1=3,odd
consider the same above combinations above,we will get yes for one
combinaton and no for another combination.hence B goes out
similarly for c we will get yes for 6,1,3 while no for 5.1,2.1,1
hence C also goes out
and giving us the answer E
Good ANSWER oa is E plz can you explain me why thanks
A+B+C is even does not mean that A,B and C are also integers. A = 1.5 B = 1.75 and C = 0.75 yields A+B+C = 4 which is even. These are simpler values. more complex would be A = 1.564325465879256 and B and C also like that........ this way the answer will be certainly E.
Moral of the Story: ALL VARIABLES ARE REAL NUMBERS UNLESS EXPLICITLY STATED _________________
Good ANSWER oa is E plz can you explain me why thanks
A+B+C is even does not mean that A,B and C are also integers. A = 1.5 B = 1.75 and C = 0.75 yields A+B+C = 4 which is even. These are simpler values. more complex would be A = 1.564325465879256 and B and C also like that........ this way the answer will be certainly E.
Moral of the Story: ALL VARIABLES ARE REAL NUMBERS UNLESS EXPLICITLY STATED
so I understood well the whole sum is an even integer it does not mean
that each part -each - has to be an integer _________________