A) An even number
That's one of these ten:
2,4,6,8,10,12,14,16,18,20
out of these twenty:
1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19.20
That's 10 ways out of 20, so we make the fraction
and reduce it to
Answer:
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B) A factor of 24
That's one of these seven:
1,2,3,4,6,8,12
out of these twenty:
1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19.20
That's 7 ways out of 20, so we make the fraction
and it doesn't reduce
Answer:
C) A prime number
That's one of these eight:
2,3,5,7,11,13,17,19
out of these twenty:
1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19.20
That's 8 ways out of 20, so we make the fraction
and reduce it to
Answer:
Edwin