GRE
Exam
Numerical Ability
Arithmetic
Theresa is building a pyramid out of stacked rows of tin cans. When completed, the top row of the pyramid contains a single tin can and each row below the top row contains 4 more cans than the one above it. If the completed pyramid contains 861 cans, then how many rows does the pyramid has ? A) 41 B) 21 C) 42 D) 20
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