10001 : 10101 :: 101 : ?Options20111100121

"""10001 : 10101 :: 101 : ?

To solve this analogy, we need to identify the pattern or relationship between the first pair of numbers and then apply the same pattern to the second pair.

Step 1: Analyze the first pair (10001 and 10101).

• Compare the binary numbers 10001 and 10101.
• Notice that the second number (10101) is obtained by changing the second digit from the left of the first number (10001) from 0 to 1.

Step 2: Apply the same pattern to the second number (101).

• The binary number 101 has three digits.
• Change the second digit from the left from 0 to 1.

Step 3: Write the new binary number.

• The original number is 101.
• Changing the second digit from 0 to 1 gives us 111.

Therefore, the answer is 111."""