Answer:
C is the answer
Step-by-step explanation:
Notice the pattern:
+1↓ 2 × 1 →
+1↓ 3 × 2 →
+1↓ 4 × 3 →
+1↓ 5 × 4 [Choice C]
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The number of dots follows this formula:
f(n) = ⅓n(n+1)(n+2)
Where f(n) is the nth step.
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