exam Maths Puzzle Numerical Ability

I need to write an verbal expression for this.... 1/3a3

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exam Other Question

An equilateral triangle of side 1 foot is contracted from wire. The midpoint of the sides of the triangle are connected with pieces of wire to form 4 equilateral triangle of side you need to select a 4 character password for a computer account. Any digit 0-9 and any letter A-Z can be used for a character, and digits and letters can be repeated. How many possible passwords are there?