1
MHT CET 2019 2nd May Evening Shift
MCQ (Single Correct Answer)
+2
-0

If $\sum_{r=1}^n(2 r+1)=440$, then $n=$ ...............

A
20
B
22
C
21
D
19
2
MHT CET 2019 2nd May Evening Shift
MCQ (Single Correct Answer)
+2
-0

If $p$ and $q$ are true and $r$ and $s$ are false statements, then which of the following is true?

A
$(q \wedge r) \vee(\sim p \wedge s)$
B
$(\sim p \rightarrow q) \leftrightarrow(r \wedge s)$
C
$(p \rightarrow q) \vee(r \leftrightarrow s)$
D
$(p \wedge \sim r) \wedge(\sim q \vee s)$
3
MHT CET 2019 2nd May Evening Shift
MCQ (Single Correct Answer)
+2
-0

If the standard deviation of the random variable $X$ is $\sqrt{3 p q}$ and mean is $3 p$ then $E\left(x^2\right)=\ldots \ldots$

A
$3 p q+3 q^2$
B
$3 p(1+2 p)$
C
$3 p q+3 p^2$
D
$3 q(1+2 q)$
4
MHT CET 2019 2nd May Evening Shift
MCQ (Single Correct Answer)
+2
-0

If $f(x)=[x]$, where $[x]$ is the greatest integer not greater than $x$, then $f^{\prime}\left(1^{+}\right)=$ ...........

A
1
B
2
C
0
D
$-$1
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