Answer:
11
Step-by-step explanation:
The prime factorization of the given product is ...
3 × 2^2 × 5 × 11 × 3·5 = 2^2 × 3^2 × 5^2 × 11
The factor required for this to be a perfect square is 11.
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Check
3·4·5·11·15 = 9900 ≈ 99.499^2
9900·11 = 108,900 = 330^2 . . . a perfect square number
