document.write( "Question 1149518: Find how many groups of one or more digits can be formed from the following digits: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 if repetition is not allowed \n" ); document.write( "

Algebra.Com's Answer #770845 by ikleyn(52778) $\"\"$ $\"About$

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document.write( "It is THE SAME as to ask: how many subsets, containing one or more items, can be formed from 10 items.\r\n" );
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document.write( "The answer is VERY WELL known.\r\n" );
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document.write( "The number of ALL subsets of the set containing  \"n\"  elements is .\r\n" );
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document.write( "One of this sets is empty, which is not considered (not allowed) in this problem.\r\n" );
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document.write( "So, the final answer is   = 1024 - 1 = 1023 subsets.\r\n" );
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\n" ); document.write( "\n" ); document.write( "Look into the lesson\r
\n" ); document.write( "\n" ); document.write( " - How many subsets are there in a given finite set of n elements?\r
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