To determine the number of 1's in the binary representation of 11, follow these steps:

Step 1: Convert 11 to binary

• 11 ÷ 2 = 5 remainder 1
• 5 ÷ 2 = 2 remainder 1
• 2 ÷ 2 = 1 remainder 0
• 1 ÷ 2 = 0 remainder 1

Reading the remainders from last to first: 1011

Step 2: Count the 1's

The binary string "1011" has three 1's.

Answer: 3

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