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Multiple Choice Question withOnly One Choice Correct
An organ pipe, open at both ends and another organ pipe, closed at one end, will resonate with each other, if their lengths are in the ratio of

(a)	1 : 1	(b)	1 :4
(c)	2 : 1	(d)	1 : 2

Chemistry

Fill in the Blank :
The filling of degenerate orbitals by electrons is governed by ....... rule.

Mathematics

Suppose A is a matrix such that A² = A and (I + A)¹⁰ = I + kA, find k.

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