The first and the last terms of an A.P. are 1 and 11 respectively. If the sum of its terms is 36, then the number of terms is :
6
7
8
9
AP
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Question

The first and the last terms of an A.P. are 1 and 11 respectively. If the sum of its terms is 36, then the number of terms is : 1. 6 2. 7 3. 8 4. 9

KnowledgeBoat · Accepted Answer

Given, a = 1 l = 11 Let no. of terms be n. Sn = 36 We know that, ⇒ Sn = (a + l) ⇒ 36 = (1 + 11) ⇒ 36 × 2 = n(12) ⇒ n = ⇒ n = 6. Hence, option 1 is the correct option.

Mathematics

The first and the last terms of an A.P. are 1 and 11 respectively. If the sum of its terms is 36, then the number of terms is :
6
7
8
9

AP

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The first and the last terms of an A.P. are 1 and 11 respectively. If the sum of its terms is 36, then the number of terms is :
6
7
8
9

For what value of k will 2k + 1, 3k + 3, and 5k − 1 be three consecutive terms of an A.P.?
1
2
4
6

If the sum of first n terms of an A.P. is S_n = 5n² + 3n, then its common difference is:
8
10
18
26

The sum of first 40 positive integers divisible by 6 is :
2460
3640
4920
4860

The sum of first 30 odd natural numbers is:
800
900
729
1249