Find the sum of all odd natural numbers less than 50.

Odd numbers less than 50 = 1, 3, 5, ........., 49. The above series is an A.P. with a = 1, d = 2 and l = 49. Let there be n terms in series, ⇒ a n = 49 ⇒ a + (n - 1)d = 49 ⇒ 1 + 2(n - 1) = 49 ⇒ 1 + 2n - 2 = 49 ⇒ 2n - 1 = 49 ⇒ 2n = 50 ⇒ n = 25. We know that, Hence, sum of odd natural numbers less than 50 = 625.

How many terms of the A.P. :
24, 21, 18, ……….. must be taken so that their sum is 78 ?

View Answer Bookmark Now

Find the sum of 28 terms of an A.P. whose n^th term is 8n - 5.

View Answer Bookmark Now

Find the sum of first 12 natural numbers each of which is a multiple of 7.

View Answer Bookmark Now

Find the sum of first 51 terms of an A.P. whose 2^nd and 3^rd terms are 14 and 18 respectively.

View Answer Bookmark Now

Mathematics

Find the sum of all odd natural numbers less than 50.

AP

Related Questions

How many terms of the A.P. :
24, 21, 18, ……….. must be taken so that their sum is 78 ?

Find the sum of 28 terms of an A.P. whose n^th term is 8n - 5.

Find the sum of first 12 natural numbers each of which is a multiple of 7.

Find the sum of first 51 terms of an A.P. whose 2^nd and 3^rd terms are 14 and 18 respectively.

Mathematics

Find the sum of all odd natural numbers less than 50.

AP

Related Questions

How many terms of the A.P. :24, 21, 18, ……….. must be taken so that their sum is 78 ?

Find the sum of 28 terms of an A.P. whose nth term is 8n - 5.

Find the sum of first 12 natural numbers each of which is a multiple of 7.

Find the sum of first 51 terms of an A.P. whose 2nd and 3rd terms are 14 and 18 respectively.

How many terms of the A.P. :
24, 21, 18, ……….. must be taken so that their sum is 78 ?

Find the sum of 28 terms of an A.P. whose n^th term is 8n - 5.

Find the sum of first 51 terms of an A.P. whose 2^nd and 3^rd terms are 14 and 18 respectively.