To find the value of 6 in the given sequence, we need to understand the pattern.
Looking at the sequence:
1=3, 2=3, 3=5, 4=4; 5=4,
We can see that the numbers on the left side of the equal sign represent the input or the given number, while the numbers on the right side represent the output or the resulting number.
Analyzing further:
1=3, 2=3, 3=5, 4=4; 5=4,
We notice that when the input is less than or equal to 4, the output is the same as the input. However, when the input is greater than 4, the output is 4.
Now, applying the pattern to find the value for 6:
Since 6 is greater than 4, the output for 6 would be 4.
Therefore, the correct answer is d. 4.