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Sheet 3. Sequences and Their Limits

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Faculty of Management  Mathematics  Exercises

Sheet 3. Sequences and Their Limits

Exercise 3.1. Give the rst ve terms of each sequence dened below a) an = 2 b) an= n(−1)n c) an= (−1)n

n + 1 + (−1)n 2 d) an = (−1)n+1· 3

n + 1 e) an= −n (2 + (−1)n) Exercise 3.2. Find the limits:

a) lim

n→∞(n2+ 5n − 6) b) lim

n→∞(−2n7+ 3n2− 4) c) lim

n→∞

n2+ 3n n2 − 1 d) lim

n→∞

6n3− 1

3n3+ 2n − 4 e) lim

n→∞

n2− 2

n f) lim

n→∞

−3n3+ 1 n2+ 4 g) limn→∞ n − 1

n2+ 2n − 1 h) limn→∞n3+ 2n − 1

n4+ n i) limn→∞ (1 − 2n)3 (2n + 3)2(1 − 7n) j) lim

n→∞

µ2n + 3 n + 1

3

k) lim

n→∞

1 − 2n 2 +

n l) lim

n→∞

2 + n 1 − 2n m) lim

n→∞

(3 −√ n)2

5 + 4n n) lim

n→∞

r9n2+ 4n

n2 + 3 o) lim

n→∞

¡√2n − 1 −√ n − 7¢ p) lim

n→∞

¡3n −√

9n2+ 1¢

q) lim

n→∞

¡√4n2+ 9n − 2 − 2n¢

r) limn→∞

¡√4n2+ 5n − 2 − 2n¢

s) limn→∞

¡3n −√

9n2+ 6n − 5¢

t) limn→∞

¡√n + 1 −√ n¢

u) limn→∞en+1n v) limn→∞2n1 w) limn→∞

3n− 2n

4n− 3n x) limn→∞4n−1− 5 22n− 7 y) lim

n→∞

2n+1− 3n+2

3n+2 z) limn→∞

µ 1 + 1

n

3n

aa) limn→∞

µ 1 − 1

3n

n

ab) lim

n→∞

µ

1 + 2 n + 1

n+1

ac) lim

n→∞

µn + 4 n

2n

ad) lim

n→∞

µn − 1 n + 2

n

ae) limn→∞

µn2+ 9 n2

n2

af) limn→∞

µn2− 1 n2

2n2

ag) limn→∞

µn2 + 2 n2 + 1

n2

ah) lim

n→∞

sin n

n + 1 ai) lim

n→∞

n

n2+ 1sin (3n + 1) aj) lim

n→∞

3

n2sin n n + 1

Last update: October 17, 2008 1

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