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The sum ∑r=0m10Cr * 20Cm-r is maximum when m=1)52)103)154)20Show the steps..How to expand∑r=0m10Cr * 20Cm-r . Please show the expansion.

Meghendra Agrawal , 6 Years ago
Grade
anser 1 Answers
Arun

Last Activity: 6 Years ago

Dear student
 
we get expansion as
 
10 C0 20Cm + 10C1  20Cm-1 + …...... + 10Cm 20C0
 
on combining
 
 = 30Cm
 
hence maximum at 30/2 = m
 
m = 15

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