Ask a Doubt
Request a call back

Join NOW to get access to exclusive study material for best results

CBSE Class 11-science Answered

Out of 600 mobile owners investigated, 500 owned Nokia hand set and 180 owned Tata hand set; 30 owned both Nokia and Tata hand sets. Is this data correct?
Asked by Topperlearning User | 17 Apr, 2014, 01:18: PM
answered-by-expert Expert Answer

Let U denote the universal set consisting of all mobile owners, N denote the set of all owners of Nokia hand set and T denote the set of all owners of Tata hand- set.

n(U) = 600, n(N) = 500, n(T) = 180, n(N  T) = 30.
So, we have
n (N T)   = n(N) + n(T) – n(N  T)
                   = 500 + 180 – 30 = 650

Also, N  T is a subset of U.

      But  n (N  T)  n(U)

       650  600, which is impossible.

       Given data is incorrect.
Answered by | 17 Apr, 2014, 03:18: PM

Concept Videos

Multiple Choice Questions Practice Test
Answered Unanswered My Questions My Answers
CBSE 11-science - Maths
A and B are two sets such that n (A) = 4 and n(B) = 8. Find the minimum value of n(A  B).
Asked by Topperlearning User | 17 Apr, 2014, 11:58: AM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 11-science - Maths
A survey was conducted on 110 people of Delhi. It was found that 65 people watched Hindi movie and 51 watched English movie and where as 24 watched both the movies. Find the number of people who did not watch any movie on that day.
Asked by Topperlearning User | 17 Apr, 2014, 11:45: AM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 11-science - Maths
Let A and B be two finite disjoint sets such that n (A  B) = 400, n(A) = 250. Find n(B).
Asked by Topperlearning User | 04 Jun, 2014, 01:23: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 11-science - Maths
Let A and B be two finite sets such that n(A – B) = 30, n (A  B) = 180, n(A  B) = 60, find n(B).
Asked by Topperlearning User | 04 Jun, 2014, 01:23: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 11-science - Maths
Out of 600 mobile owners investigated, 500 owned Nokia hand set and 180 owned Tata hand set; 30 owned both Nokia and Tata hand sets. Is this data correct?
Asked by Topperlearning User | 17 Apr, 2014, 01:18: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 11-science - Maths
In a group of 85 people, 50 like Hindi movies, 10 like both Hindi and English movies. How many like English movies and not Hindi. How many like English movies?
Asked by Topperlearning User | 04 Jun, 2014, 01:23: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 11-science - Maths
In a group, students know at least one of the languages, German or French. 100 students know German and 40 know French and 10 know both German and French. If there are 20 students who know neither of the two languages, how many students are there in the group?
Asked by Topperlearning User | 04 Jun, 2014, 01:23: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 11-science - Maths
A class got 48 distinctions in maths, 25 in physics and 30 in chemistry. If these went to a total of 68 students and only 5 students got distinctions in all the three subjects, how many students got distinctions in exactly two of the three subjects?
Asked by Topperlearning User | 04 Jun, 2014, 01:23: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 11-science - Maths
If A and B are two sets such that  A union B  has 40 elements, A has 30 elements and B has 20 elements, how many elements does the shaded region have?
Asked by Topperlearning User | 31 Aug, 2016, 11:28: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 11-science - Maths
In a class of 60 students 30 students play harmonium and 40 students play guitar. How many students play both the instruments?
Asked by Topperlearning User | 17 Apr, 2014, 11:47: AM
ANSWERED BY EXPERT ANSWERED BY EXPERT
My Class Videos Tests ₹ Plans Ask a Doubt
Get Latest Study Material for Academic year 24-25 Click here
×