SAT Math Practice Question #3207 - SATify | SATify

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SAT Math Practice Question #3207 - SATify | SATify

#3207

algebra

operations

Relative Motion

medium

90 sec

The operation $\oplus$ is defined for all real numbers by $a \oplus b = \frac{a + b}{2}$ . Determine $[(1 \oplus 2) \oplus 3] - [1 \oplus (2 \oplus 3)]$

A.

$- \frac{1}{2}$

B.

$0$

C.

$- \frac{1}{4}$

D.

$\frac{1}{2}$

E.

$\frac{1}{4}$