Question

A binary operation * in Q defined by™. . a*b = 3ab, identity element w.r.t * is?
A)
$\frac{1}{9}$
B)
$\frac{1}{3}$
C)
$- 3$
D)
$0$
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Answer 1

I don't know sorry what is the answer

Answer 2

Answer:

c is correct answer of this question