Find three **consecutive integers** whose sum is $-42$. What is the **smallest** of the three?
A$-15$
B$-14$
C$-13$
D$-12$
Answer & Solution
Correct answer: A. $-15$
Let $n$ be the smallest integer. The three consecutive integers are $n$, $n+1$, $n+2$. Their sum is $-42$:
$n + (n+1) + (n+2) = -42$
$3n + 3 = -42$
$3n = -45$
$n = -15$.
The three integers are $-15$, $-14$, $-13$. The smallest is $-15$.
Check: $-15 + (-14) + (-13) = -42$ ✓.
- Trap B ($-14$) is the **middle** of the three — confusion about which the question asks for.
- Trap C ($-13$) is the **largest** of the three.
- Trap D ($-12$) does not appear in the triple.
Shortcut: when three consecutive integers sum to $S$, the **middle** integer is $S/3 = -42/3 = -14$, and the smallest is one less: $-15$.
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