- A72
- B36
- C64
- D56
Step-by-Step Solution
An up-and-down staircase to uses blocks: to 4 it is . To 8 it is . (36 counts only the way up.)
Answer: C) 64
The staircase goes up 1, 2, 3, 4 blocks and back down 3, 2, 1, using 16 blocks in all. How many blocks are needed for a staircase that goes up to 8 and back down to 1?
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