1
WB JEE 2020
MCQ (Single Correct Answer)
+1
-0.25
Change Language
The expression ax2 + bx + c (a, b and c are real) has the same sign as that of a for all x if
A
b2 $$ - $$ 4ac > 0
B
b2 $$ - $$ 4ac $$ \ne $$ 0
C
b2 $$ - $$ 4ac $$ \le $$ 0
D
b and c have the same sign as that of a
2
WB JEE 2020
MCQ (Single Correct Answer)
+1
-0.25
Change Language
In a 12 storied building, 3 persons enter a lift cabin. It is known that they will leave the lift at different floors. In how many ways can they do so if the lift does not stop at the second floor?
A
36
B
120
C
240
D
720
3
WB JEE 2020
MCQ (Single Correct Answer)
+1
-0.25
Change Language
If the total number of m-element subsets of the set A = {a1, a2, ..., an} is k times the number of m element subsets containing a4, then n is
A
(m $$ - $$ 1)k
B
mk
C
(m + 1)k
D
(m + 2)k
4
WB JEE 2020
MCQ (Single Correct Answer)
+1
-0.25
Change Language
Let I(n) = nn, J(n) = 13.5 ......... (2n $$ - $$ 1) for all (n > 1), n $$ \in $$ N, then
A
I(n) > J(n)
B
I(n) < J(n)
C
I(n) = J(n)
D
I(n) = $${1 \over 2}$$J(n)
EXAM MAP
Medical
NEET
Graduate Aptitude Test in Engineering
GATE CSEGATE ECEGATE EEGATE MEGATE CEGATE PIGATE IN
Civil Services
UPSC Civil Service
Defence
NDA
CBSE
Class 12