Find the sum of first fifteen multiples of 8.

Question

KnowledgeBoat · Accepted Answer

8, 16, 24,......,(upto 15th term). The above is an A.P. with common difference equal to 8. We know that, Sum of n terms of an A.P. is given by, ∴ Sn = [2a + (n - 1)d] Given, a = 8 d = 16 - 8 = 8 n = 15 S15 = [2(8) + (15 - 1)8] = [16 + (14)8] = [16 + 112] = (128) = 15 × 64 = 960. Hence, S15 = 960.

Mathematics

Find the sum of first fifteen multiples of 8.

AP

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Mathematics

Find the sum of first fifteen multiples of 8.

AP

Related Questions

Find the sum of all even numbers between 10 and 100.

Find the sum of all odd numbers between 100 and 150.

The nth term of an Arithmetic Progression (A.P.) is given by the relation Tn = 6(7 - n). Find ∶(a) its first term and common difference(b) sum of its first 25 terms

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The n^th term of an Arithmetic Progression (A.P.) is given by the relation T_n = 6(7 - n). Find ∶
(a) its first term and common difference
(b) sum of its first 25 terms