Recent content by Irish teacher

Hi ILS thankyou so much for your replyThat's so useful.I'm concerned though as we teach the AND and OR equations So if it asks below 400 or divisible by 5 we would say OR P(aor b) = pa + pb -( p (a+b). Then if it's 400 and divisible by 5 we would use the AND equation P( a+b) = pa x pb...

Hello all I'm new as I'm just revising my maths to teach irish leavers in revising and exams maths and sciences. This exam section has me puzzled hope you can help Three digit numbers are made from the numbers 2,3,4,5,6 .. See questions and my calls below Total number of outcomes is ...