Sasmo has replied and the correct ans is 9. They made a mistake. Tks

Sasmo has replied and admitted the error. Yes our answer 9 is correct. Tks

Thanks for all your feedback. I didnt realise there is another thread for such qns. I found it n have posted it there. Same ans 9. Anyway, i just wanted to share my experience with such qns as they can be found in the heuristics section of some schools. No intention to scare anyone n sorry if i did. Thank goodness we all hv the same ans.

I also had 9 as my ans. But the online quiz mked it as wrong. Ans is 7. Could be an error. So i will inform Sasmo abt it. Tks

A bag contains a total of 12 of four different colours. There are 3 balls of each colour in the bag. What is the least number of balls to be picked (without looking) for three balls to be of the same colour?


Ans: 7
Can anyone explain, pls?

The ans is 7. Qn came fr SASMO, olympiad maths. I also thought ans is 9.

5.4×5=27

To add another number, then there are 6 numbers.
6×6=36
36-27=9
So must add the number 9.

5.4×5=27

If add another number, then total is 6numbers
6×6=36
36-27=9
So must add 9.

A bag contains a total of 12 of four different colours. There are 3 balls of each colour in the bag. What is the least numberof balls to be picked (without looking) for three balls to be of the same colour? Can anyone help?