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In the attached image,x+y+z+w=8 reduced to t1+t2+t3+t4=4 .but all x,y,z,w lie between 0 and 3 inclusive.Also all t1,t2,t3,t4 lie between 0 and 3 inclusive .
can anyone explain this strange behaviour.??

Praveen Kumar Das , 6 Years ago
Grade 12th pass
anser 1 Answers
Arun

Last Activity: 6 Years ago

Dear Praveen
 
try to solve on your own
 
x1 + x2 + x3 + x4 = 12
 
atleast one should provided to everyone.
 hence give one one
Now
x1 + x2 + x3 + x4 = 8
 
Now
8-1C4-1 – 4C1 =  7C3 – 4 = 31
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