Doubts in this slide

#1

how 2n-1 come here, from where this value arise.

how 1 1 equals to 2n-1

#2

@simar4303_9715cda6958f0652 1 1 is not equal to 2^(n-1) . (=>)This sign means implied not equal.
So 1 1 implies that there can be 2^(n-1) possible combinations of 2 bit binary no. (for eg, 00 11 01 10)

#3

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#4

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