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Q.

If ax1=bc,by1=ca,cz1=ab, then xy+yz+zx=

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a

1

b

xyz

c

1xyz

d

1

answer is B.

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Detailed Solution

ax1=bc

axa=bc

ax=abc

a=(abc)1x(i)

by1=ca

byb=ca

by=abc

b=(abc)1y(ii)

cz1=ab

czc=ab

cz=abc

c=(abc)1z(iii)

(i)×(ii)×(iii)

abc=(abc)1x.(abc)1y.(abc)1z

abc=(abc)1x+1y+1z

(abc)1=(abc)yz+xz+yxxyz

xy+yz+zxxyz=1xy+yz+zx=xyz

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