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Question

r1(r2+r3)r1r2+r2r3+r3r1=

A
a
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B
b
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C
c
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D
a2
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Solution

The correct option is A a
r1=Δ(sa),r2=Δ(sb),r3=Δ(sc)
=Δsa(Δ(sb)+Δsc)Δ(sa)×Δ(sb)+Δ(sc)Δ(sb)+Δ×Δ(sa)(sc)

=Δ(sc+sb(sb)(sc)(sa))sa+sb+sc(sa)(sb)(sc)

=Δas(sb)(sc)(sc)
=a

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