alleryRow sizes rise equally; row 4 has 19 and row 10 has 49. Row 15 size?
A79
B74
C69
D84
Answer & Solution
Correct answer: B. 74
The increase per row is (49 − 19) ÷ 6 = 5, so row 15 has 49 + 5 × 5 = 74.
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