allery200টি পরিবারের একটি গ্রামে, 120টি পরিবারের গরু রয়েছে এবং 90টি পরিবারের ছাগল রয়েছে; 30টি পরিবারের উভয়ই রয়েছে। কতটি পরিবারের কোনোটিই নেই?
A20
B10
C30
D40
Answer & Solution
Correct answer: A. 20
অন্তত একটির মালিক = 120 + 90 - 30 = 180, সুতরাং 200 - 180 = 20 টির কোনোটিই নেই।
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