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22. Which of the following is a singleton set?(C) {x : x2 + 2x + 1 = 0,KEN)(D) {x:x2 = 7, x e N) |
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Answer» So, we knowx² + 2x + 1 = 0 ( x + 1)² = 0 x = -1 Therefore this set have only one element -1 Set is { -1} So, it is singleton option (D) is correct |
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