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UPSC 2024 · Q36 · Science & Technology › Materials & Engineering · Save

In which of the following are hydrogels used ? 1. 2. 3.

Select the correct answer using the code given below :

(a) 1 only
(b) 1 and 2 only
(c) 2 and 3 only
(d) 1, 2 and 3
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Answer: (a) 1 only