If you compare the advantages and disadvantages of symmetric key cryptography and asymmetric key cryptography based only on the number of keys each mechanism needs to create. The less the better.

Under what condition, symmetric key cryptography is better?

Under what condition, asymmetric key cryptography is better?

Under what condition, they are tie?

What you need to find out are

The range of the number of users when symmetric key cryptography is better than asymmetric key cryptography.

The range of the number of users when symmetric key cryptography is worse than asymmetric key cryptography.

The range of the number of users when symmetric key cryptography is as good as asymmetric key cryptography $.$Links to an external site.

Your answer will looks like this

$200<$ N $<300$ symmetric key cryptography is as good as asym

N $<=200$ symmetric key cryptography is better

$300<=$ N asymmetric key cryptography is better

Note: $-$ N represents number of users.

$-$ This answer is an example, it is not the correct answer,

You can figure out the answers by first figuring out the formulas for

Number$\_$of$\_$keys$=$f$($N$)$

Thus,

How many keys are required for N number of users if symmetric key cryptography is used?

How many keys are required for N number of users if asymmetric key cryptography is used?

Comparing the formulas, you will be able to figure out the answers.