If f:Q Q is defined as f(x) = x^2 then f^-1 (9) is equal to ?
3
-3
{-3,3}
Not
3 racers ffA, B and C were running together in the same direction in a race, on a circular track with diameter 140 m. The race started in such a way that C was 110 meters ahead of B, who in turn was 55 meters ahead of A. If the speeds of A, B and C were 11, 5.5 and 16.5 m/s respectively, In how much time did A, B and C find themselves at the same relative distance as they were at the start?
1) 40/3
2) 80/3
3) 40
4) 80
From a group of six players, in how many ways can we make 2 doubles teams to play a tennis match while the remaining two would be referees?
Select one:
a. 45
b. 90
c. 96
d. 720
e. None of the above
How many 4-digit numbers can be formed by using exactly 3 different digits?
Select one:
a. 75
b. 720
c. 1080
d. 3888
e. None of the above
A number of four digits is formed with the help of the digits 1, 2, 3, 4, 5, 6 and 7 in all possible ways. Find how many of these are even?
Select one:
a. 168
b. 360
c. 420
d. 840
e. None of the above
A train is going from Cambridge to London stops at nine intermediate station. Six persons enter the train during the journey with six different tickets. How many different sets of ticket they have had?
Select one:
a. 42C8
b. 42C6
c. 45C6
d. 45C9
e. None of the above
If 3f(x) +5 f(1/x) = 1/x-3 for all non zero x then f(x) = ?
1/14(3/x+5x-6)
1/14(-3/x+5x-6)
1/14(-3/x+5x+6)
NOT
A train is going from Cambridge to London stops at nine intermediate station. Six persons enter the train during the journey with six different tickets. How many different sets of ticket they have had?
Select one:
a. 42C8
b. 42C6
c. 45C6
d. 45C9
e. None of the above
hello guys can someone just me some good source from where i can solve Trignometry and Coordinate Geometry ?
In how many ways can 24 persons be seated round a table, if there are 13 seats?
Select one:
a. 24!/(13!x11!)
b. 24!/(13 x 11!)
c. 24!/13!
d. 24!/11!
e. None of the above
Find the number of positive solutions of equations X + Y + Z + W = 20 under the conditions when zero values are excluded?
Select one:
a. 969
b. 1320
c. 4800
d. 6400
e. None of the above
11 pm.. Functions/Geo is Coming .. 🍻
How many integral solutions are there to x + y + z + t = 29, when x > 1, y > 1, z > 3 and t > 0?
Select one:
a. 2400
b. 2600
c. 2700
d. 3600
e. None of the above
if x,y are positive integers...and
5x+7y>310 , 17x+10y
then, what is the maximum product of x,y..
180 ? 182 ? 192? 198 ?
ans: 198..
can someone pls tell me the approach..preferably without using graphs
India plays two matches each with the West Indies and Australia. In any match the probability of India getting points 0, 1 and 2 are 0.45, 0.05 and 0.50 respectively. Assuming that the outcomes are independent, the probability of India getting at least 7 points is
Select one:
a. 0.0250
b. 0.0625
c. 0.0875
d. 0.8750
e. None of the above
Two persons L and M decide to meet at a hotel between 4:00 p.m. and 5:00 p.m. on a certain day. They also agree that the one who comes first would wait for the other for 15 minutes. If the other person does not arrive within the waiting period of 15 minutes, they would not meet each other. What is the probability that L and M meet?
Select one:
a. 3/32
b. 5/16
c. 7/16
d. 3/8
e. None of the above
Feedback
The correct answer is: None of the above.
Two persons L and M decide to meet at a hotel between 4:00 p.m. and 5:00 p.m. on a certain day. They also agree that the one who comes first would wait for the other for 15 minutes. If the other person does not arrive within the waiting period of 15 minutes, they would not meet each other. What is the probability that L and M meet?
Select one:
a. 3/32
b. 5/16
c. 7/16
d. 3/8
e. None of the above
Feedback
The correct answer is: None of the above.
Two persons L and M decide to meet at a hotel between 4:00 p.m. and 5:00 p.m. on a certain day. They also agree that the one who comes first would wait for the other for 15 minutes. If the other person does not arrive within the waiting period of 15 minutes, they would not meet each other. If L arrives at 4:15 p.m., what is the probability that L and M meet each other?
Select one:
a. 1/4
b. 1/3
c. 1/2
d. 3/4
e. None of the above
There are 100 tokens numbered from 1 to 100. In how many ways can two tokens be drawn simultaneously so that their sum is more than 100?
Select one:
a. 2500
b. 2550
c. 4950
d. 5050
e. None of the above
Feedback
If Token 1 = 1 then Token 2 = 100If Token 1 = 2 then Token 2 = 100, 99If Token 1 = 3 then Token 2 = 100, 99, 98If Token 1 = 4 then Token 2 = 100, 99, 98, 97If Token 1 = 5 then Token 2 = 100, 99, 98, 97, 96If Token 1 = 6 then Token 2 = 100, 99, 98, 97, 96, 95If Token 1 = 7 then Token 2 = 100, 99, 98, 97, 96, 95, 94 .
The probability that Sachin scores a century in a match is 0.4. He is 3 centuries away from breaking the world record. He has to announce his retirement. After how many minimum possible number of matches should he announce in order to ensure a 30% probability of scoring atleast 3 centuries?
Select one:
a. 4
b. 5
c. 6
d. 7
e. None of the above