Discussion

Explanation:

We know, 22 = 4.

∴ In the number 1101 make pairs of 2 digits starting from right and write them in base 10.

11    01
P2    P1

P1: (01)2 = 1.

P2: (11)2 = 3.

∴ The final answer is (1101)2 = (31)4.

Hence, 31.

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