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# Probability watch

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1. Hello I am new to this forum. I had this question in my exam (i am in year 9 and i did level 6-8 paper): a teacher picks cards from 1-10 she says'I have got an odd number is the probability of picking a square number?

The second question was: I have picked odd number ranging from 1 to 10 what is the probability of picking a square number?

.....Thanks for any replies
2. (Original post by BULL14)
Hello I am new to this forum. I had this question in my exam (i am in year 9 and i did level 6-8 paper): a teacher picks cards from 1-10 she says'I have got an odd number is the probability of picking a square number?

The second question was: I have picked odd number ranging from 1 to 10 what is the probability of picking a square number?

.....Thanks for any replies
Welcome

Your question is not really clear

I have chosen one card from the card labelled 1-10, it is odd, what is the probability that it is also square?

OR

I have chosen one card which is odd, I will now choose another, what is the probability that will be square?

I am inclined to think you are asking the first question - in which case what are the possible cards you could have, how many are square?
3. There were two questins which were asked in a similar format, I am sorry my wording of the questions may be unclear The techaer picks ten cards labelled from one to ten, what is the probability of picking card which is a odd number as well as being a square number?

in the exam I wrote 2/10 (simplified to 1/5) I think this is wrong hence my class mates said it was 2/5, because the techar chooses the odd numbers than she picks the square number, so the asnswer should be out of 5
4. (Original post by BULL14)
There were two questins which were asked in a similar format, I am sorry my wording of the questions may be unclear The techaer picks ten cards labelled from one to ten, what is the probability of picking card which is a odd number as well as being a square number?

in the exam I wrote 2/10 (simplified to 1/5) I think this is wrong hence my class mates said it was 2/5, because the techar chooses the odd numbers than she picks the square number, so the asnswer should be out of 5

The teacher has already told you that the card is odd so the only possibilities are 1, 3, 5, 7, 9

Of these, there are 2 squares

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