Brain Teasers
5, 8, 11, 13, 15, 18, 21, 23, 25, ?
What's the next number in this series?
5, 8, 11, 13, 15, 18, 21, 23, 25, ?
5, 8, 11, 13, 15, 18, 21, 23, 25, ?
Answer
28.The nth entry is the nth composite number plus n.
5=4+1, 8=6+2, 11=8+3, 13=9+4, 15=10+5, 18=12+6, 21=14+7, 23=15+8, 25=16+9, 28=18+10.
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Comments
hmmm.....I thought it went +2+2+3+3+2+2+3+3......
or vice versa!
I thought the same +3 +3 +2 +2 +3 +3 +2+2 +3
May 07, 2006
I thought what they thought
Again, exactly the same until we hit n=15
the person who made this should have gone past n=15 then it would have been hard to figure out, but as it is its really easy
hmmm.....I thought it went +2+2+3+3+2+2+3+3......
or vice versa!
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