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Option 3 : 55
The shaded part represents is the number of librarians are there who are also post-graduates .
[ alt="D1 PujaT Madhuri 18.02.2022 D8" src="//storage.googleapis.com/tb-img/production/22/02/D1_PujaT_Madhuri_18.02.2022_D8.png" style="width: 321px; height: 144px;">
The number of librarians are there who are also post-graduates = 25 + 30 = 55
Hence, ‘55’ is the correct answer.
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