Bird watchers 75 In persons से 15 Person only 'सनबर्ड' Want to see हैं 10 Person only 'फ्लाईकेचर' Want to see हैं 12 person 'सनबर्ड' And 'नाटहेच' Both Want to see हैं 15 Person only 'बी-इटर' Want to see हैं 13 person 'सनबर्ड' And 'बी-इटर' Want to see both हैं 5 person 'फ्लाईकैचर' And 'नाटहेच' Want to see both And the remaining people only 'नाटहेच' Want to see 'सनबर्ड' Viewing person and फ्लाईकेचर' Watchers Find the difference between individuals.