MathLab programing techniques (online course) problem

I have problem with the anwer the question i the following quiz

The question is visible in attachment.

Thanks for any help

Sylwia

[Dave B]

Can you rule any of these out?

How many values are stored in each one?

[Sylwia Terlicka]

I do not know how many values are storage in each one, that is the question right from the quiz.

I try to pick all of them, first one, two, three and four, and other combinations and it was all wrong.

The hint is -> A double array requires 8 bytes per element. The functions ones, zeros, and randn all create double arrays.

[DGM]

The memory() call says you have 10.15E9 bytes available for arrays.

x = randn(1,1E9);

creates a 1x1E9 double array occupying 8E9 bytes.

x = [randn(1,1E9); randn(1,1E9)];

creates two 1x1E9 double arrays and vertically concatenates them to form a 2x1E9 array.