<Table> <Tr> <Th> Activity </Th> <Th> Predecessor </Th> <Th_colspan="3"> Time estimates </Th> <Th> Expected time (T) </Th> </Tr> <Tr> <Th> Opt . (O) </Th> <Th> Normal (M) </Th> <Th> Pess . (P) </Th> </Tr> <Tr> <Th> </Th> <Td>--</Td> <Td> </Td> <Td> </Td> <Td> 6 </Td> <Td> 4.00 </Td> </Tr> <Tr> <Th> </Th> <Td>--</Td> <Td> </Td> <Td> 5 </Td> <Td> 9 </Td> <Td> 5.33 </Td> </Tr> <Tr> <Th> </Th> <Td> </Td> <Td> </Td> <Td> 5 </Td> <Td> 7 </Td> <Td> 5.17 </Td> </Tr> <Tr> <Th> d </Th> <Td> </Td> <Td> </Td> <Td> 6 </Td> <Td> 10 </Td> <Td> 6.33 </Td> </Tr> <Tr> <Th> </Th> <Td> b, c </Td> <Td> </Td> <Td> 5 </Td> <Td> 7 </Td> <Td> 5.17 </Td> </Tr> <Tr> <Th> f </Th> <Td> d </Td> <Td> </Td> <Td> </Td> <Td> 8 </Td> <Td> 4.50 </Td> </Tr> <Tr> <Th> g </Th> <Td> </Td> <Td> </Td> <Td> 5 </Td> <Td> 8 </Td> <Td> 5.17 </Td> </Tr> </Table> <Tr> <Th> Activity </Th> <Th> Predecessor </Th> <Th_colspan="3"> Time estimates </Th> <Th> Expected time (T) </Th> </Tr> <Tr> <Th> Opt . (O) </Th> <Th> Normal (M) </Th> <Th> Pess . (P) </Th> </Tr> <Tr> <Th> </Th> <Td>--</Td> <Td> </Td> <Td> </Td> <Td> 6 </Td> <Td> 4.00 </Td> </Tr>

When does p and o 2 for 1 start