KA-0109
about 75sA staircase of blocks has 4 blocks in the first step, 7 in the second and 10 in the third. How many blocks are in the eighth step?
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Two steps, or one step plus a trap.
3 in a row to finish this ladder.
0/1 solvedA staircase of blocks has 4 blocks in the first step, 7 in the second and 10 in the third. How many blocks are in the eighth step?