If the average of \( a, b, c \) and \( d \) is the average of \( b ...
If the average of \( a, b, c \) and \( d \) is the average of \( b \) and
P \( c \), then which one of the following is necessarily
W true?
(1) \( a+d=b+c \)
(2) \( a+b=c+d \)
(3) \( a-d=b-c \)
(4) \( \frac{a+d}{4}=\frac{b+c}{2} \)
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