A triangle was made with 10 blocks in the first level, 9 in the second level and so on. how many blocks were used in the triangle if the last level had only one block?
with solution po sana
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A triangle was made with 10 blocks in the first level, 9 in the second level and so on. how many blocks were used in the triangle if the last level had only one block?
with solution po sana
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