27. Which equation represents positron decay? (1) 87/37Rb + 0/-1 e + 87/38Sr (2) 227/92U → 233/90 Th + 4/2He
(3) 27/13AI + 4/2He + 30/15P +1/0n
(4) 11/6C → 0/+1e+ 11/5B

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