how to pass formdata object with parameter in ajax web method

//var fileInput = document.getElementById('fi');
var count = $("input[type=file]")
for (j = 0; j < count.length; j++)
{
   var formdata = new FormData(); //FormData object
   var fileInput = document.getElementById(count[j].id);
   //Iterating through each files selected in fileInput
   for (i = 0; i < fileInput.files.length; i++)
   {
      //Appending each file to FormData object
      formdata.append(fileInput.files[i].name, fileInput.files[i]);
   }
   //Creating an XMLHttpRequest and sending
   $.ajax(
   {
      url: '/Booking/Upload',
      type: 'POST',
      contentType: false,
      processData: false,
      data: {formdata ,"file":"1"
   },
   success: function (data)
   {
      alert(data);
   }
});