Gcse maths mocks question paper?

There are only (n +1) black buttons and (n-1) white buttons in a tin. Salma takes at random two buttons from the tin.
Work out the probability that both buttons are white.

Original post by tj1107

There are only (n +1) black buttons and (n-1) white buttons in a tin. Salma takes at random two buttons from the tin.
Work out the probability that both buttons are white.

what have you tried so far / what are your thoughts?

OP

Original post by chavvo

what have you tried so far / what are your thoughts?

I have worked out the proabability of the first black one and what one black and white adds up to

Original post by tj1107

I have worked out the proabability of the first black one and what one black and white adds up to

Can you post your working?

OP

Original post by Muttley79

Can you post your working?

i cant but i will send a link to someone elses which is like mine
https://www.reddit.com/r/GCSE/comments/19516tt/can_someone_tell_me_how_to_do_this_question_math/

Original post by tj1107

i cant but i will send a link to someone elses which is like mine
https://www.reddit.com/r/GCSE/comments/19516tt/can_someone_tell_me_how_to_do_this_question_math/

Makes no sense and it's a different question.

What's the prob that the first is black?

you will need to work out the total buttons in the tin

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