Row 0 has one number
Row 1 has two numbers
.
.
.
and so on
Therefore, row 42 must have 43 numbers.
The first number starts \(\binom{n}{0}\)with, the second number, \(\binom{n}{1}\) , and so on..
Thus, the answer is \(\binom{42}{1}=\boxed{42}.\)
Hope that helped!
