Was n't the Fedorov Avtomat the first assault rifle instead of the StG 44 ?
Determine whether the sequence an = -LRB- 1 ^ 3 -RRB- / -LRB- n ^ 4 -RRB- + -LRB- 2 ^ 3 -RRB- / -LRB- n ^ 4 -RRB- + ⋯ + -LRB- n ^ 3 -RRB- / -LRB- n ^ 4 -RRB- converges or diverges . If it converges , what is the limit ?