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never [62]
3 years ago
12

The number of bricks on the bottom row was 21, and each row above it had 2 fewer

Mathematics
2 answers:
dlinn [17]3 years ago
7 0

Answer:

121

Step-by-step explanation:

21-2x

add all of the sums from 0 - 11

emmainna [20.7K]3 years ago
3 0

Answer: 121

Step-by-step explanation:

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