For all numbers $x, y$ , and $z$ , let $x △ y △ z$ be defined by $x △ y △ z = x - y + z$ . What is the value of $1 △ 2 △ 3$ ?

1

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2

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3

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4

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5

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Solution

The correct option is B $2$
$X Δ Y Δ Z = x - y + z$
$1 Δ 2 Δ 3 = 1 - 2 + 3$
$= - 1 + 3$
$= 2$

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