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Q.

 For natural numbers m,n if (1-y)m(1+y)n=1+a1y+a2y2+, and a1=a2=10 , then (m,n) is

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a

(45,35)

b

(35,45)

c

(35,20)

d

(20,45)

answer is B.

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Detailed Solution

  (1-y)m(1+y)n=1+a1y+a2y2+1-C1   my+C2   my2-1+C1   ny+C2   ny2+==1+a1y+a2y2+a1=C1   n-C1   m,a2=C2   mC  m1nC1nC2n-m=10, m2+n2-m-n-2mn=20n-m=10,( m-n)2-(m+n)=20n-m=10,n+m=80m=35,n=45

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