After 5 years, the activity of 100-Pa is reduced by a factor of
4. By how much is it additionally reduced after 15 years?
a) 16x
b) 64x
c) 4x
d) 256x
After 5 years, the activity of 100-Pa is reduced by a factor of 4. By how much is it additionally reduced after 15 years
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After 5 years, the activity of 100-Pa is reduced by a factor of 4. By how much is it additionally reduced after 15 years
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