Question

a.If A and B are disjoint then AnB= b.write the solution of the equation ×^2+×-2=0 in roaster form c.In a group of students 100 knows hindi 50 know English and 33 know both .Each student knowso either two language .How many students are there in group?

Answer 1

Answer:

a) ¢ b) { } c) 117

Step-by-step explanation:

1) ¢ nullset

2) x^2+1/x^2 = 0

since square of two numbers is +ve and sum of two positives never be zero, it has no solutions at all

hence ans = { } = ¢ (null set)

3) n(HUE) = n(H) + n(E) - n( H^E)

n(HUE) = 100 + 50 - 33

total studentsn(HUE) = 117