Question

एका परिक्षेत ३०% विद्यार्थी गणितात नापास झाले२०%विद्यार्थी इंग्रजीत नापास झाले व १०% विद्यार्थी दोन्ही व विषयांत नापास झाले तरी दोन विषयाच्या घेतलेल्या परीक्षेत किती टक्के विद्यार्थी उत्तीर्ण झाले​

Answer 1

Given

Number of student fail in math= 30%

number of student fail in English = 20%

Number of students fail in both subject =10%

Now

let the total number of students be x

according to question.

Number of student pass in both subject = n(A n B )= - n(A u B ) + nA + nB

n(A n B) = 30+20 - 10 = 40%

so 40% Student pass in both subjects