document.write( "Question 1194442: 1. How many different 4-digit numbers can be formed from the digits 2, 3, 4, 5, 6, 7, and 9:
\n" ); document.write( "a) if repetition of digits is NOT allowed?
\n" ); document.write( " b) if repetition of digits is allowed?
\n" ); document.write( "c) How many of them are odd numbers?
\n" ); document.write( " d) How many of them are even numbers?\r
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Algebra.Com's Answer #826653 by Alan3354(69443)\"\" \"About 
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1. How many different 4-digit numbers can be formed from the digits 2, 3, 4, 5, 6, 7, and 9:
\n" ); document.write( "a) if repetition of digits is NOT allowed?
\n" ); document.write( "There are 7 numbers.
\n" ); document.write( "The 1st choice is 1 of 7, then 1 of 6, 1 of 5, 1 of 4.
\n" ); document.write( "---> 7*6*5*4
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\n" ); document.write( " b) if repetition of digits is allowed?
\n" ); document.write( "Each selection is 1 of 7 ---> 7*7*7*7
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\n" ); document.write( "c) How many of them are odd numbers?
\n" ); document.write( "With or without repetition?
\n" ); document.write( " d) How many of them are even numbers?
\n" ); document.write( "With or without repetition?
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