Chapter 9 – Sequences and Series
11. Sum of the first p, q and r terms of an A.P. are a, b and c, respectively. Prove that
27
Oct
11. Sum of the first p, q and r terms of an A.P. are a, b and c, respectively. Prove that 11. Sum of the first p b and c`. q and r terms of an A.P. are a respectively. Prove that October 27, 2021 Category: Chapter 9 - Sequences and Series , Maths , [...]
10. If the sum of first p terms of an A.P. is equal to the sum of the first q terms, then find the sum of the first (p + q) terms.
27
Oct
10. If the sum of first p terms of an A.P. is equal to the sum of the first q terms, then find the sum of the first (p + q) terms. 10. If the sum of first p terms of an A.P. is equal to the sum of the first q terms then find [...]
9. The sums of n terms of two arithmetic progressions are in the ratio 5n + 4 : 9n + 6. Find the ratio of their 18th terms
27
Oct
9. The sums of n terms of two arithmetic progressions are in the ratio 5n + 4 : 9n + 6. Find the ratio of their 18th terms 9. The sums of n terms of two arithmetic progressions are in the ratio 5n + 4 : 9n + 6. Find the ratio of their 18th [...]
8. If the sum of n terms of an A.P. is (pn + qn^2), where p and q are constants, find the common difference.
27
Oct
8. If the sum of n terms of an A.P. is (pn + qn^2), where p and q are constants, find the common difference. 8. If the sum of n terms of an A.P. is (pn + qn^2) find the common difference. where P and Q are constants October 27, 2021 Category: Chapter 9 - [...]
7. Find the sum to n terms of the A.P., whose k th term is 5k + 1.
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Oct
7. Find the sum to n terms of the A.P., whose k th term is 5k + 1. 7. Find the sum to n terms of the A.P. whose k th term is 5k + 1. October 27, 2021 Category: Chapter 9 - Sequences and Series , Maths , NCERT Exemplar Class 11 ,
6. If the sum of a certain number of terms of the A.P. 25, 22, 19, … is 116. Find the last term.
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Oct
6. If the sum of a certain number of terms of the A.P. 25, 22, 19, … is 116. Find the last term. -22 … is 116. Find the last term. 19 6. If the sum of a certain number of terms of the A.P. 25 October 27, 2021 Category: Chapter 9 - Sequences and [...]
5. In an A.P., if p th term is 1/q and qth term is 1/p , prove that the sum of first pq terms is 1/2 (pq +1), where p ≠ q.
27
Oct
5. In an A.P., if p th term is 1/q and qth term is 1/p , prove that the sum of first pq terms is 1/2 (pq +1), where p ≠ q. 5. In an A.P. if p th term is 1/q and qth term is 1/p prove that the sum of first pq terms [...]
4. How many terms of the A.P. – 6, -11/2 , – 5, … are needed to give the sum –25?
27
Oct
4. How many terms of the A.P. – 6, -11/2 , – 5, … are needed to give the sum –25? -11/2 … are needed to give the sum –25? 4. How many terms of the A.P. – 6 5 October 27, 2021 Category: Chapter 9 - Sequences and Series , Maths , NCERT Exemplar [...]
3. In an A.P., the first term is 2 and the sum of the first five terms is one-fourth of the next five terms. Show that 20th term is –112.
24
Oct
3. In an A.P., the first term is 2 and the sum of the first five terms is one-fourth of the next five terms. Show that 20th term is –112. 3. In an A.P. the first term is 2 and the sum of the first five terms is one-fourth of the next five terms. Show [...]
2. Find the sum of all natural numbers lying between 100 and 1000, which are multiples of 5.
24
Oct
2. Find the sum of all natural numbers lying between 100 and 1000, which are multiples of 5. 2. Find the sum of all natural numbers lying between 100 and 1000 which are multiples of 5. October 24, 2021 Category: Chapter 9 - Sequences and Series , Maths , NCERT Exemplar Class 11 ,