Rithvik's Blog 11+

Amy has a bag containing red, blue, and green marbles only. The probability of picking a red marble is 1/4, and the probability of picking a blue marble is 1/3. What is the probability of picking a green marble?

A number is called 'special' if it is a three-digit number and its digits are in arithmetic sequence. How many 'special' numbers are there where the middle digit is 5?

A bag contains 5 red balls, 3 blue balls, and 2 green balls. What is the probability of drawing a blue ball?

How many different 3 digit numbers can you make from the digits 1, 1 and 3? You can use each digit as many times as you like.