"probsoln" package random default arguments

Question

I'm trying to have random values as the default arguments for a question in probsoln. e.g.:

In the following, a and b are random default arguments.

\newproblem[2][{a}{b}]{
     What is #1 multiplied by #2?
}
{
    FPeval(\result}{#1*#2}
    \result
}

The reason I want to do this is because

 \loadrandomproblems[test]{5}{file}

 \foreachproblem[test]{\item \thisproblem}

Will not let me provide arguments unless I use package option usedefaultargs.

So far I have tried variants of:

\newproblem[2][{\random{a}{1}{100}}{b}]{
     What is #1 multiplied by #2?
}
{
    FPeval(\result}{#1*#2}
    \result
}

but I'm not having any success with that.