- #1
forty
- 135
- 0
1 + 2 + 3 + ... + n = n(n+1)/2
I need to prove this by first principles and by induction.
I am extraordinarily stuck with this and don't really know where to begin, I've tried writing the LHS in terms of n then trying to simplify but am pretty much stuck. Any suggestions of how to begin for either method would be very much appreciated!
I need to prove this by first principles and by induction.
I am extraordinarily stuck with this and don't really know where to begin, I've tried writing the LHS in terms of n then trying to simplify but am pretty much stuck. Any suggestions of how to begin for either method would be very much appreciated!