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An Intiative by Sri Chaitanya
a
The substance completely disintegrates in 20 days.
b
The substance completely disintegrates in 40 days.
c
1/8 part of the total number of active nuclei of the substance will be left infact at the end of 40 days.
d
7/8 th part of the total number of active nuclei of the substance disintegrates in 30 days.
answer is D.
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