SAT Math Practice Question #23519 - SATify | SATify

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SAT Math Practice Question #23519 - SATify | SATify

#23519

algebra

functions

easy

90 sec

For each pair of real numbers $a \neq = b$ , define the operation $a \circ b$ as $a \circ b = \frac{a - b}{a + b} .$ What is the value of $(2 \circ 3) \circ 4$ ?

A.

$- \frac{21}{19}$

B.

$- \frac{19}{21}$

C.

$\frac{19}{21}$

D.

$\frac{21}{19}$

E.

This value is not defined.