Which of the sets given is the set of five positive integers such that their square is odd?
A
{3,5,7,9,10}
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B
{1,2,4,6,8}
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C
{1,3,5,7,11}
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D
None of these
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Solution
The correct option is B{1,3,5,7,11} The set of positive integer is {1,2,3,4,5,....} . Clearly, 12=1,32=9,52=25,72=49,112=121 Therefore, the required set={1,3,5,7,11}