Awesome Quadruples
Probability
Level
pending
Find the number of quadruple ( a,b,c,d ) of integers satisfying a+b+c+d= 50 and a> or = 30 , b>21, c> or = 1 and d> or = 1 ??
The answer is 18424.
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1 solution
https://books.google.co.id/books?id= qwZFyQf-DQC&pg=PA95&lpg=PA95&dq=(+a,b,c,d+)+of+integers+satisfying+a%2Bb%2Bc%2Bd%3D+50+and+a%3E%3D+30+,+b%3E21&source=bl&ots=qL hAhUrBP&sig=yt nd5xnmcAPVBKXqZMmFt rBfM&hl=en&sa=X&ved=0ahUKEwjWvvfYtczPAhUJupQKHcStB6gQ6AEIITAB#v=onepage&q&f=false