document.write( "Question 1090391: Carmen is playing with blocks. She arranges stacks of blocks so that each successive level of blocks has 1 fewer block than the level below it and the top level has one block. The stack shown has 1 block on level 1, 2 blocks on level 2, and 3 blocks on level 3. Carmen wants to make such a stack with 12 levels. how many blocks would she use to build this stack? \n" ); document.write( "
Algebra.Com's Answer #704955 by Fombitz(32388)\"\" \"About 
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\"N=%28n%2A%28n%2B1%29%29%2F2\"
\n" ); document.write( "So then for 12 levels, \"n=12\",
\n" ); document.write( "\"N=%2812%2813%29%29%2F2\"
\n" ); document.write( "\"N=78\"\r
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