From OG pg. 331 #126
If ° represents one of the operations +, -, and X,
is k ° ( l+ m) = (k °l ) + (k ° m) for all numbers k, l,
and m ?
(1) k ° 1 is not equal to 1 ° k for some numbers k.
(2) ° represents subtraction.
Answer is D
My question (more spoilers):
Given statements 1 &2, I understand ° must be "-". This also means that,
k-l-m= k-l + k - m
k-l-m= 2k - l - m
If k =0, then the equation above is certainly true; but, k can be any number. So, shouldn't the answer be E instead?
Thanks!
If ° represents one of the operations +, -, and X,
is k ° ( l+ m) = (k °l ) + (k ° m) for all numbers k, l,
and m ?
(1) k ° 1 is not equal to 1 ° k for some numbers k.
(2) ° represents subtraction.
Answer is D
My question (more spoilers):
Given statements 1 &2, I understand ° must be "-". This also means that,
k-l-m= k-l + k - m
k-l-m= 2k - l - m
If k =0, then the equation above is certainly true; but, k can be any number. So, shouldn't the answer be E instead?
Thanks!
