Find the sum of the first 40 positive integers divisible by 6.

List of positive integers divisible by 6 are : 6, 12, 18, ........ The above list is an A.P. with first term (a) = 6 and common difference (d) = 12 - 6 = 6. By formula, Sum of first n terms = S n = Substituting values we get : Hence, sum of first 40 positive integers divisible by 6 = 4920.

Show that a₁, a₂,……., a_n,…….. form an AP where a_n is defined as below :
(i) a_n = 3 + 4n
(ii) a_n = 9 - 5n
Also find the sum of the first 15 terms in each case.

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If the sum of the first n terms of an AP is 4n – n², what is the first term (that is S₁)? What is the sum of first two terms? What is the second term? Similarly, find the 3rd, the 10th and the nth terms.

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Find the sum of the first 15 multiples of 8.

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Find the sum of the odd numbers between 0 and 50.

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Mathematics

Find the sum of the first 40 positive integers divisible by 6.

AP

Related Questions

Show that a₁, a₂,……., a_n,…….. form an AP where a_n is defined as below :
(i) a_n = 3 + 4n
(ii) a_n = 9 - 5n
Also find the sum of the first 15 terms in each case.

If the sum of the first n terms of an AP is 4n – n², what is the first term (that is S₁)? What is the sum of first two terms? What is the second term? Similarly, find the 3rd, the 10th and the nth terms.

Find the sum of the first 15 multiples of 8.

Find the sum of the odd numbers between 0 and 50.

Mathematics

Find the sum of the first 40 positive integers divisible by 6.

AP

Related Questions

Show that a1, a2,……., an,…….. form an AP where an is defined as below :(i) an = 3 + 4n(ii) an = 9 - 5nAlso find the sum of the first 15 terms in each case.

If the sum of the first n terms of an AP is 4n – n2, what is the first term (that is S1)? What is the sum of first two terms? What is the second term? Similarly, find the 3rd, the 10th and the nth terms.

Find the sum of the first 15 multiples of 8.

Find the sum of the odd numbers between 0 and 50.

Show that a₁, a₂,……., a_n,…….. form an AP where a_n is defined as below :
(i) a_n = 3 + 4n
(ii) a_n = 9 - 5n
Also find the sum of the first 15 terms in each case.

If the sum of the first n terms of an AP is 4n – n², what is the first term (that is S₁)? What is the sum of first two terms? What is the second term? Similarly, find the 3rd, the 10th and the nth terms.