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Q: .
question image
  • A. 7
  • B. 18
  • C. 12
  • D. 15
Correct Answer: Option B - According to Venn-diagram, Number of envelopes which are not pens = (12 + 6) = 18
B. According to Venn-diagram, Number of envelopes which are not pens = (12 + 6) = 18

Explanations:

According to Venn-diagram, Number of envelopes which are not pens = (12 + 6) = 18