Question

If you solve all Its better and ill mark you brainliest for sure but if the your wrong ill choose the other person. subject: Maths

Answer 1

Answer:

Correct = 38

Let n(A)= number of students opted Mathematics =70,

n(B)= number of students opted Physics =46,

n(C)= number of students opted Chemistry =28,

n(A∩B)=23,

n(B∩C)=9,

n(A∩C)=14,

n(A∩B∩C)=4,

Now n(A∪B∪C)

=n(A)+n(B)+n(C)−n(A∩B)−n(B∩C)−n(A∩C)+n(A∩B∩C)

=70+46+28−23−9−14+4=102

Si number of students not opted for any course = Total −n(A∩B∩C)

=140−102=38

Answer 2

Step-by-step explanation:

Step 1

use angle aum property and find C

Step 2

Use Linear pair concept and find b

Step 3

Use vertically opposite angle property with angle sum property to find A