| 22. | Which number finishes the sequence? |
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| 23. | A man has 30 socks in his drawer : 21 identical blue, 15 identical black and 17 identical red. The lights are fused and he is completely in the dark. How many socks must he take out to make 100 percent certain he has a pair of black socks? |
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| 24. | How many different sized circles appear below? |
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