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How do you evaluate such a large expression even using calculators? (10^9 - 1)!!  Note: !! stands for "double factorial function". Please help and many thanks.

 Aug 25, 2018
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(10^9 - 1)!!  =   

 

1 * 3 * 5 * 7 *  ......* (10^9 - 3) * (10^9 -1)  =

 

The product of all the odd positive interegers  from 1 to 10^9 -1

 

This product is extremely large.....WolframAlpha  shows  

 

≈ 1.58084425021110638757272554931990100564787932540... × 10^4282852759

 

 

cool cool cool

 Aug 25, 2018

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