- #1

Irish teacher

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Three digit numbers are made from the numbers 2,3,4,5,6 .. See questions and my calls below

Total number of outcomes is ... 5x4x3 = 60

Number of outcomes under 400 ... 2/5 x 60 = 24

Number of outcomes divisible by 5 ... 1/5 x 60 = 12

Here's the tricky bit

Number of outcomes both under 400 and divisible by five... If I list these there are 6 but if I try the AND equation it's 4.8 ( 1/5x2/5 x 60) what am I missing in the calculation?

I'm sure it's something obvious but I'm completely blind to it. Hope you can help IT