a pile of blocks has 60 blocks in th bottom row, 54 blocks in the second row, 48 blocks in the thurd row, ans so on until there are only 6 blocks on the top row. How many blocks are there in all?
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Answer:
330
Step-by-step explanation:
60-6=54 (6 is the common difference)
54-6=48
and so on
12-6=6
(60+54+48+42+36+30+24+18+12+6=330)