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What kind of circular logic is that ?

N = 1.5

N = 1.5

The solution to your question is very simple. You just need a value, which when multiplied by 2/3 results in the number 1. For this purpose you can solve the above mathematical expression as an equation.

2/3xN=1

2N=3

N=3/2

Hence

2/3x3/2 is the expression that will result in the number 1

2/3xN=1

2N=3

N=3/2

Hence

2/3x3/2 is the expression that will result in the number 1