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Purines found both in DNA and RNA are:

1. Adenine and thymine
2. Adenine and guanine
3. Guanine and cytosine
4. Cytosine and thymine

Correct answer: Adenine and guanine

Solution

Adenine and guanine are the two purine bases, and both occur in DNA and RNA. Thymine is found in DNA, while uracil replaces it in RNA; cytosine is a pyrimidine.

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