1.5 Sequences

1.

(a) $\infty$ (b) 0 (c) $\infty$ (d) $1$ (e) 0

2.

(a) bounded，monotonically decreasing (b) bounded，monotonically increasing

3.

(a) $${\frac{1}{n!}}$$ (b) $2n-1$ (c) $${n^{2}}$$