Question
Which element in the modern periodic table has the same
number of valence electrons as that of caesium?Solution
The correct answer is C
- ‘A’ and ‘B’ play a game in which a coin is tossed 4 times. ‘A’ wins if at least 3 heads appear. Find the probability that ‘A’ wins.
The names of 8 students from section A, 9 students from section B and 10 students from section C were selected. The age of all the 27 students was diffe...
A bag contains 6 Green and 8 Red balls. One ball is drawn at random. What is the probability that the ball drawn is Red?
- Amar tells the truth in 75% of cases and Akbar in 25% of cases.Find the probability that at least one of them tells the truth in a trial.
A bowl contains 9 blue balls, 7 white, and 5 black balls. If 2 balls are drawn in one go, then the probability of exactly one ball being blue is:
A sack contains 'r' silver balls and 12 gold balls. If the probability of getting a silver ball is 1/4, then find the probability of getting different c...
A number is chosen at random from first 20 natural numbers. Find the probability that the chosen number is prime.
- A 6-digit number is formed using the digits 1, 2, 3, 4, 5 and 6. If each digit can be used only once, then find the probability that the number formed will...
35 defective headphones got packed with 105 non-defective headphones. A customer randomly chooses one headphone. Find the probability that it is defective.
In a bag, there are 7 red balls, 5 black balls, and 9 green balls. If two balls are selected at random, what is the likelihood of picking one red ball a...
