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Option 4 : 10
The shaded part represents is the number of teachers who are writers, but NOT dancers.
[ alt="F2 Puja T 19-01-22 Savita D18" src="//storage.googleapis.com/tb-img/production/22/01/F2_Puja%20T_19-01-22_Savita_D18.png" style=" width: 327px; height: 144px;">
The number of teachers who are writers, but NOT dancers = 10
Hence, ‘10’ is the correct answer.
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