निम्नलिखित घटनाओं को कालक्रमानुसार रखिएः
A. 1 2 3 4
B. 4 2 3 1
C. 2 3 1 4
D. 3 4 2 1
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1234,2341,3421,4231....
Answered by
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a 1234
b 1324
c 1432
d1234
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