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JEE Advanced 2021 Full Test 1 Paper 1

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PART – III
Mathematics
SECTION – A (One Options Correct Type)
This section contains 06 multiple choice questions. Each question has four choices (A), (B), (C) and (D), out of which ONLY ONE option is correct.
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Question : 42 of 54
 
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A square ABCD of a diagonal 2a is folded along the diagonal AC, so that the planes DAC, BAC are at right angle. The shortest distance between DC and AB is
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