exam Maths Puzzle Numerical Ability

Find the inverse of the following matrix.

[3 2]
[0 1]

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exam Other Question

Prove The following identity:

The Sum of (n,k)*((m-n),(n-k)) with k = 0 to n =(m,n)

The Sum of N choose K times m subtract n choose n subtract k from k equal 0 to n is equal Translate to an equation and find all solutions:
The length of a rectangle is 6m more than the width. the area is 40m^2. Find the length and the width