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Earlier discussion
2 older comments kept for context.
Oluwaseun Adeyemi
1/64 is the usual fraction left of any radio active material after 4 half-lives, since 1/64 = (1/2)6
This implies that 6 half lives have elapsed.
Thus 6 half lives = 120 years
∴ 1 half life = 120/6 = 20 years
Mira Kosi
Is there any other formula that can be used