If there are 10 balls each of Red, blue and green color in a box, then what is the minimum number of balls that should be taken out of the box to ensure that 3 of them are safe color

  1. 23
  2. 22
  3. 7
  4. 12

You have 5 boxes of muffins. Each muffin weighs 100 grams, except for hollow muffins contained in one box, where each muffin weighs 90 grams. Given a scale, how could you tell which box has hollow muffins in just one measurement?

What is the minimum count of use of weighing balance to find a defective ball that has more weight out of the 9 balls. All 8 others are identical and have same weight?

  1. 4
  2. 3
  3. 2
  4. 1

You are blindfolded and given a deck of cards in which exactly 16 cards are facing up. You have to divide it into 2 piles having exactly same number of cards facing up. How would you do it.