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Idk, sometimes there may be a typo, but okay...

Maybe he/she means that they need help on their prep for their final exam?

Please, I'm sorry. Why is everyone after me? I'm not perfect.

Okay, okay. I'm sorry. I just forgot to give him a point. I was just trying to ask if there was a way to do it without a calc. That's all.

Is there a way to do this without calc?

Thanks you. This is a great solution! But is there a way to do it without calc, because in this competition, calculators are not allowed.

Deleted

Prime factor 9!:

3^2 x 2^3 x 7 x 2 x 3 x 5 x 2^2 x 3 x 2 = 2^7 x 3^4 x 5 x 7

So, the number of factors is 8 x 5 x 2 x 2 = 160.

You can just count the number of factors of 1000, which is 4x4=16.

Wait, but you already defined b to be 2. Then how can it be 0 or 2?