Question 1:an = n (n + 2)
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Question 2:an = 1 n n +
Exercise 9.1 maths class 11 Chapter 9 Sequences and Series
Question 3:an = 2n
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Question 4:an = 2 3 6 n −
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Question 5:an = (–1)n–1 5n+1
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Question 6:an 2 5 4 n n + = . Find the indicated terms in each of the sequences in Exercises 7 to 10 whose nth terms are:
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Question 7:an = 4n – 3; a17, a24
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Question 8:an = 2 7 ; 2n n a
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Question 9:an = (–1)n – 1n3; a9
EXERCISE 9.1Write the first five terms of each of
Question 10:20 ( – 2) ; 3 n n n a a n = + . Write the first five terms of each of the sequences in Exercises 11 to 13 and obtain the corresponding series:
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Question 11:a1 = 3, an = 3an – 1 + 2 for all n > 1
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Question 12:a1 = – 1, an = n 1 a n − , n ³ 2
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Question 13:a1 = a2 = 2, an = an – 1–1, n > 2
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Question 14:The Fibonacci sequence is defined by 1 = a1 = a2 and an = an – 1 + an – 2, n > 2. Find n 1 n a a + , for n = 1, 2, 3, 4, 5
