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How many subsets of { 1, 2, 3, 4, 5, 6, 7, 8 } contain 4 consecutive numbers ? |
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Answer» ong>Answer: total NUMBER of co-prime =4,6,8,9=4. number of POSSIBLE subsects with these numbers=4c2+4c2+4c3+4c4+1 (for null SET)= 4+6+4+1+1=16 |
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