1
TS EAMCET 2023 (Online) 12th May Evening Shift
MCQ (Single Correct Answer)
+1
-0

Assertion (A) The variance of the first $n$ odd natural numbers is $\frac{n^2-1}{3}$.

Reason (R) The sum of the first $n$ odd natural numbers is $n^2$ and the sum of the squares of the first $n$ odd natural numbers is $\frac{n\left(4 n^2-1\right)}{3}$.

Which of the following alternatives is correct?

A
(A) and (R) are true, (R) is correct explanation of (A)
B
(A) and (R) are true, (R) is not a correct explanation of (A)
C
(A) is true but (R) is false
D
(A) is false but (R) is true
2
TS EAMCET 2023 (Online) 12th May Evening Shift
MCQ (Single Correct Answer)
+1
-0

If $A$ and $B$ are two events of a random experiment such that $P(A \cup B)=P(A \cap B)$, then which one amongst the following four options is not true?

A
$A$ and $B$ are equally likely
B
$P\left(A \cap B^{\prime}\right)=0$
C
$P\left(A^{\prime} \cap B\right)=0$
D
$P(A)+P(B)=1$
3
TS EAMCET 2023 (Online) 12th May Evening Shift
MCQ (Single Correct Answer)
+1
-0

If a group of six students including two particular students $A$ and $B$ stand in a row, then the probability of getting an arrangement in which $A$ and $B$ are separated by exactly one student in between them is

A
$2 / 15$
B
$4 / 15$
C
$6 / 15$
D
$8 / 15$
4
TS EAMCET 2023 (Online) 12th May Evening Shift
MCQ (Single Correct Answer)
+1
-0

$A, B, C, D$ cut a pack of 52 well shuffled playing cards successively in the same order. If the person who cuts a spade first, wins the game and the game continues until this happens, then the probability that $A$ wins the game is

A
$\frac{74}{175}$
B
$\frac{44}{175}$
C
$\frac{54}{175}$
D
$\frac{64}{175}$
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