Answer
Verified
387k+ views
Hint: We can solve the problem by using the general relations and using the Venn diagram.
We will apply the formula of \[n(H \cup E) = n(H) + n(E) + n(H \cap E)\]. Here, \[H\] means number of students who can speak Hindi and \[E\] means the number of students who can speak English.
Then, using the formula and given information we can find the number of students who can speak both.
Complete step by step answer:
It is given that; the total number of students in the class is \[45\].
The number of students who can speak Hindi is \[22\].
The number of students who can speak English is \[12\].
We have to find the number of students who can speak both Hindi and English.
So, as per the given information
\[n(H \cup E) = 45\]
\[n(H) = 22\]
\[n(E) = 12\]
Let us consider the number of students who can speak both Hindi and English is \[x\] that is \[n(H \cap E) = x\].
We have to find the value of \[n(H \cap E)\].
We know that,
\[ \Rightarrow n(H \cup E) = n(H) + n(E) + n(H \cap E)\]
Substitute the values in the above formula we get,
\[ \Rightarrow 45 = 22 + 12 + x\]
Simplifying we get,
\[ \Rightarrow x = 11\]
Hence, the number of students who can speak both Hindi and English is \[11\].
$\therefore $ The correct answer is option A) \[11\]
Note:
We can solve the sum by using a Venn diagram.
Here, the red shaded part indicates the number of students who can speak Hindi is \[22\].
The blue shaded part indicates the number of students who can speak English is \[12\].
The green shaded part indicates the number of students who can speak both Hindi and English.
The total number of students in the class is \[45\].
We have to find the value of the green shaded part.
So, the value of green-shaded part is
\[45 - (22 + 12) = 11\]
Hence, the number of students who can speak both Hindi and English is \[11\].
We will apply the formula of \[n(H \cup E) = n(H) + n(E) + n(H \cap E)\]. Here, \[H\] means number of students who can speak Hindi and \[E\] means the number of students who can speak English.
Then, using the formula and given information we can find the number of students who can speak both.
Complete step by step answer:
It is given that; the total number of students in the class is \[45\].
The number of students who can speak Hindi is \[22\].
The number of students who can speak English is \[12\].
We have to find the number of students who can speak both Hindi and English.
So, as per the given information
\[n(H \cup E) = 45\]
\[n(H) = 22\]
\[n(E) = 12\]
Let us consider the number of students who can speak both Hindi and English is \[x\] that is \[n(H \cap E) = x\].
We have to find the value of \[n(H \cap E)\].
We know that,
\[ \Rightarrow n(H \cup E) = n(H) + n(E) + n(H \cap E)\]
Substitute the values in the above formula we get,
\[ \Rightarrow 45 = 22 + 12 + x\]
Simplifying we get,
\[ \Rightarrow x = 11\]
Hence, the number of students who can speak both Hindi and English is \[11\].
$\therefore $ The correct answer is option A) \[11\]
Note:
We can solve the sum by using a Venn diagram.
Here, the red shaded part indicates the number of students who can speak Hindi is \[22\].
The blue shaded part indicates the number of students who can speak English is \[12\].
The green shaded part indicates the number of students who can speak both Hindi and English.
The total number of students in the class is \[45\].
We have to find the value of the green shaded part.
So, the value of green-shaded part is
\[45 - (22 + 12) = 11\]
Hence, the number of students who can speak both Hindi and English is \[11\].
Recently Updated Pages
Assertion The resistivity of a semiconductor increases class 13 physics CBSE
The Equation xxx + 2 is Satisfied when x is Equal to Class 10 Maths
How do you arrange NH4 + BF3 H2O C2H2 in increasing class 11 chemistry CBSE
Is H mCT and q mCT the same thing If so which is more class 11 chemistry CBSE
What are the possible quantum number for the last outermost class 11 chemistry CBSE
Is C2 paramagnetic or diamagnetic class 11 chemistry CBSE
Trending doubts
Difference between Prokaryotic cell and Eukaryotic class 11 biology CBSE
Fill the blanks with the suitable prepositions 1 The class 9 english CBSE
Write an application to the principal requesting five class 10 english CBSE
Difference Between Plant Cell and Animal Cell
a Tabulate the differences in the characteristics of class 12 chemistry CBSE
Change the following sentences into negative and interrogative class 10 english CBSE
What organs are located on the left side of your body class 11 biology CBSE
Discuss what these phrases mean to you A a yellow wood class 9 english CBSE
List some examples of Rabi and Kharif crops class 8 biology CBSE