A and B are two radioactive substances w...

`A` and `B` are two radioactive substances whose half lives are `1` and `2` years respectively. Initially `10 gm` of `A` and `1 gm` of `B` is taken. The time (approximate) after which they will have same quantity remaining is.

6.62 years

5 years

3.2 years

7 years

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