having/ o have

[miteshpant]

Having more than the usual numbers of fingers or toes on the hands or feet is termed polydactyly.

• Having more than the usual numbers of fingers or toes
  
  Having had more than the usual number of fingers or toes
  
  Having more than the usual number of fingers or toes
  
  To have more than the usual number of fingers or toes
  
  To have more than the usual numbers of fingers or toes

[Jim@StratusPrep]

To have is correct, but doubtful this is something the GMAT will test. The GMAT is more concerned eith your ability to communicate, not memorize every exception in the english language.