MEDIUM
Defence
IMPORTANT
Earn 100
While writing all the numbers from to , how many numbers occur in which the first digit is greater than the second digit, and the second digit is greater than the third digit?
50% studentsanswered this correctly
Important Questions on General Mental Ability (Quantitative Aptitude /Reasoning)
HARD
Defence
IMPORTANT
Four-digit numbers are to be formed using the digits and and none of these four digits are repeated in any number. Further
1. and are not immediately follow each other.
2. is not to be immediately followed by .
3. is not to appear at the last place.
4. is not to appear at the first place.
How many different numbers can be formed?
MEDIUM
Defence
IMPORTANT
In how many different ways can identical coins be placed on a chessboard (containing identical squares) so that all of them lie along the same line (Each of the coins is to be placed in a different square)?
MEDIUM
Defence
IMPORTANT
A coin is tossed times. What is the probability that Head (H) appears an odd number of times?
EASY
Defence
IMPORTANT
A freight train left Delhi for Mumbai at an average speed of . Two hours late, an express train left Delhi for Mumbai, following the freight train on a parallel track at an average speed of . How far from Delhi would the express train meet the freight train?
HARD
Defence
IMPORTANT
There are three tables containing two drawers each. One of the tables contains a gold coin in each of its drawers, another table contains a silver coin in each of its drawers while the third table contains a gold coin in one drawer and a silver coin in the other. One of the drawers of a table is opened and found to contain a silver coin. What is the probability that its other drawer contains a gold coin?
MEDIUM
Defence
IMPORTANT
Out of the total of musicians, can play all the three instruments - guitar, violin and tabla. musicians among them can play any two and only two of the above instruments. The number of musicians who can play guitar alone is What is the number of musicians who can play violin alone or table alone?
MEDIUM
Defence
IMPORTANT
What is the number of integers greater than that can be formed with the digits and , no digit being repeated?
MEDIUM
Defence
IMPORTANT
Six have to be placed in the squares of the figure given below such that each horizontal row contains at least one . How many maximum different ways can this be done?
