A) Copper, zinc and nickel
B) Copper and silver
C) Copper, zinc and tin
D) Copper, zinc and silver
Correct Answer: A
Solution :
\[\underset{60%}{\mathop{Cu}}\,+\underset{20%}{\mathop{Zn}}\,+\underset{20%}{\mathop{Ni}}\,\]
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