Show that a1, a2,…, an form an AP where an is defined as below.an = 9 – 5n. Also, find the sum of the first 15 terms in each case.

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Show that a1, a2,…, an form an AP where an is defined as below.an = 9 – 5n. Also, find the sum of the first 15 terms in each case.

Show that a1, a2,…, an form an AP where an is defined as below.

(ii) an = 9 – 5n. Also, find the sum of the first 15 terms in each case.

Previous How many terms of the AP: 9, 17, 25, … must be taken to give a sum of 636.
Next If the sum of first n terms of an AP is 4n – n2, what is the first term i.e. S1? What is the sum of the first two terms? What is the second term? Similarly, find the 3rd, then 10th, and nth terms.

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