In dimer of phosphorus pentaoxide, in what order number of `P-P, P=O` & `P-O-P` bonds are there ?

P-O-P bond is present in

In a molecule of pyrophosphoric acid, the number of P-OH, P = O and P - O - P bonds/moiety(ies) respectively are :

In a molecule of pyrophosphoric acid, the number of P-OH, P = O and P - O - P bonds/moiety(ies) respectively are :

P-O-P bond is present in :

The number of P-P bond in P_4O_10 is

How many number of P - O - P bonds in P_4 O_(10) ?