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Q.

Match List-I with List-II and select the correct answer using the code given below the list.

 COLUMN-I COLUMN-II
A)Let  α,β,γ,δ  be the roots of the equation  x4x3+2x2+x+1=0 , then the value of  (α3+1)(β3+1)(γ3+1)(δ3+1)  isP)0
B)The value of 218045  k=1179sink0  isQ)4
C)If complex numbers  z1,z3 and  z3 are the vertices of an isosceles right angled triangle, right angled at the vertex  z2, then  (z1z2)2+(z3z2)2 equalsR)8
D)Let  Z=12(3i). If the least positive integer value of ‘n’ such that (z101+i109)106=zn  is ‘k’ then 25k  isS)16

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a

AQ, BR, CP, DS 

b

AS, BP, CR, DQ

c

AS, BR, CP, DQ

d

AQ, BP, CR, DS

answer is C.

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Detailed Solution

A)  (α3+1)(β3+1)(γ3+1)(δ3+1)
 T1(α+1)(α+ω)(α+ω2) =f(1)f(ω)f(ω2) =(4)(2ω2+2)(2ω+2) =(4)(4)=16
B)  k=1179sink=sin1sin2sin179z180=1
 z1801=(z1)(zα)(zα179) z1801z1=(zα)(zα2)(zα179) (180)=(12)179sin1sin2sin179 sin1sin2sin179=1802179 218045sin1sin2sin179=23=8
C. we know that  z3z2z1z2=|z3z2||z1z2|.eiπ2
 z3z2=i(z1z2)(z3z2)2+(z1+z2)2=0
D.    z=12i(1+i3)=iω2                     z101=iω
 (z101+i100)106=(iω2)106=ω2
   ω2=(iω2)2n=iπω2n      ω2π2iπ=1
This is possible only when N + 4r + 2 and 2x -2 is multiple of 3 i.e., 2 (4r + 2) – 2 is multiply of 3
i.e., 8r + 2 is multiple of  3r=2x=1025k=4

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