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Q.

If 1(1x)(12x)(13x)=a1x+b12x+c13x , then a1+b3+c5=

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a

115

b

16

c

15

d

13

answer is A.

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Detailed Solution

1(1x)(12x)(13x)=a1x+b12x+c13x

1=a(12x)(13x)+b(1x)(13x)+c(1x)(12x)

Put x=121=b(12)(132)1=b(12)(12)b=4

Put x=11=a(1)(2)a=12

Put x=131=c(113)(123)1=c(23)(13)c=92

a1+b3+c5=1243+910=115

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