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	Column I		Column II
(a)	Infrared radiation	(p)	Study of photoelectric effect
(b)	Microwaves	(q)	Long distance communication via satellite
(c)	X-rays	(r)	Study of crystal structure
(d)	Ultraviolet rays	(s)	Heating of earth' s atmosphere by green house effect

True or False :
Lead is the stable end product of all natural radioactive elements

Find the number of ways of putting 5 identical objects into 8 distinct boxes so that no box contains more than one object.

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