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'Producing Zeros' printed from https://nrich.maths.org/
Answer: Two zeros
You could write this problem out as $1\times3\times4\times6\times7\times8\times9\times(2\times5)\times10$. The product of the first seven numbers is not a multiple of ten, but the last part gives us $10\times10$ so the overall product must be a multiple of $100$, but not a multiple of $1000$. So the answer is two zeros.