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XI- CHAPTER-9: Sequence and Series

WORKSHEETS

Answer the following:

2
Q1. If the sum of n terms of an A.P. is given by S n = 3n + 2n , then the common difference of the
A.P. is
(a) 3
(b) 2
(c) 6
(d) 4

Q2 . If the third term of G.P. is 4, then the product of its first 5 terms is
3
(a) 4
4
(b) 4
5
(c) 4
(d) none of these

Q3. If 9 times the 9th term of an A.P. is equal to 13 times the 13th term, then the 22nd term of
the A.P. is
(a) 0

(b) 22
(c) 198
(d) 220

Q4. If a, b and c are in G.P., then the value of is equal to _________

Q5. The third term of a G.P. is 4. The product of the first five terms is ……….

Q6. Find the 7th term of A.P. in which the first term is 7 and the common
difference is – 3.
Q7. Find the A.M. between 5 – 4 & 5 +4

Q8. Find the G.P. of which the third term is 4 and 6th is –32.

Q9. Find the sum of the series 3 + 11 + 19 + -------------- to 16 terms.

Q10. Find the sum of all natural numbers from 1 to 500 which are divisible by 3.

Q11. Insert 6 G.Ms between 2 and 256.