The average (mean) life of a radio nuclide which decays by parallel path is
`Aoverset(lambda_(1))(rarr)B` : `lambda_(1)=1.8xx10^(-2)sec^(-1)`
`2Aoverset(lambda_(2))(rarr)B` , `lambda_(2)=10^(-3)sec^(-1)`
A. `52.63 sec`
B. `500 sec`
C. `50 sec`
D. none of these
