Vishnu holds a magnet above 3 pins made of different materials. Pins Y and Z gets attracted whereas pin X remain in its place.
What metals can the pins X, Y and Z be made of?
Pin X Pin Y Pin Z
a. Copper Iron Steel
b. Steel Nickel Aluminium
c. Copper Brass Cobalt
d. Iron Copper Brass
KINDLY EXPLAIN

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Solution

This means that X is not magnetic, but Y and Z are magnetic.
This is only true in the part a, where copper is not magnetic, but Iron and steel are.

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