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Q.

All possible quadratic equations ax2 +bx+1 = 0 taking a{1,2,3,..n},b{1,2,3,n} and if αi,βi i=1,2,3n represent solution sets of these equations then  1αi+1βi eqauls

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a

n(n+1)2

b

n2(n+1)2

c

n2

d

n3(n+1)2

answer is B.

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Detailed Solution

ax2 + bx +1  0 has roots αi,βi

x2+bx+a=0 has roots1αi,1βi.

There are n2 equations
 G.E. =1αi+1βi=(b)=n(1+2+3+.+n)=nn(n+1)2=n2(n+1)2

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All possible quadratic equations ax2 +bx+1 = 0 taking a∈{1,2,3,…..n},b∈{−1,−2,−3,……−n} and if αi,βi i=1,2,3……n represent solution sets of these equations then  ∑1αi+∑1βi eqauls