CBSE 11TH MATHEMATICS - Online Test

Answer : Option C
Explaination / Solution:

Answer : Option B
Explaination / Solution:

Answer : Option D
Explaination / Solution:

S.D=n2−112−−−−√

so it depends only on number of observations not on individual observations.

Answer : Option A
Explaination / Solution:

Distance between two parallel lines is given by |c1−c2|A2+B2√

c1 = 2 x 11 = 22 and c2 = 15 and A = 8 and B = 6

Now substituting the values we get

|22−15|36+64√ = 7/10

 

Answer : Option A
Explaination / Solution:

rules of negation ∼(p→q)≡p∧∼q Hence ∼p∧(∼q∧∼r)

Answer : Option B
Explaination / Solution:

When n = 1 we have a + b.And the subsequent substitution of n as 2,3,... will result in the expression whose factor is a + b.

Answer : Option D
Explaination / Solution:

Given 9x2 - 16y2 = 144

Dividing throughout by 144 we get,

x216 - y29 = 1

This implies a2 = 16 and b2 = 9

e = a2+b2√a = 54

Answer : Option B
Explaination / Solution:

Answer : Option A
Explaination / Solution:

Let the friends be A,B,C,D,E,F,G,H,I , J and assume A and B will not battend together

Case 1 : Both of them will not attend the party : Now we have to select the 6 guests from the remaing 8 members 

 Then no of ways is 8C6 = 28 ways.

Case 2 : Either of them are selected for the party :Now we have to select the 5 guests from the remaing 8 members and  one from A and B

Then the no of ways = 2C1 x 8C5 =112 ways.

Therefore total number of ways is 28+ 112 = 140 ways,

Answer : Option A
Explaination / Solution:
No Explaination.