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The number of `alpha` and `beta`- emitted during the radioactive decay chain starting from `._(226)^(88) Ra` and ending at `._(206)^(82) Pb` is
A. `3alpha & 6 beta^(-)`
B. `4alpha & 5beta^(-)`
C. `5alpha & 4 beta^(-)`
D. `6 alpha & 6beta^(-)`

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