SlotSequence (##)

##
represents the sequence of arguments supplied to a pure function.

##n
represents the sequence of arguments supplied to a pure function, starting with the n^th argument.

## is used to represent sequences of arguments in pure functions of the form body& or Function[body].

A sequence of arguments supplied to a pure function is "spliced" into the body of the function wherever ## and so on appear.

## represents the complete sequence of arguments supplied to the pure function:

Start with the second argument: