Final answer:
The number of permutations of 6 different objects taken all together is 720, which is calculated as the factorial of 6.
Step-by-step explanation:
The number of permutations of 6 different objects taken all together is calculated by taking the factorial of the number of objects. This is because each of the 6 objects can be placed in the first position, and for each of those choices, the remaining 5 can take the next position, and so on.
The calculation is therefore 6 * 5 * 4 * 3 * 2 * 1, which equals 720. So, the correct answer is (d) 720.