Show that a1, a2, . . ., an, . . . form an AP where an is defined as below : (i) an = 3 + 4n (ii) an = 9 – 5n

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asked Apr 25, 2017 in Mathematics by sforrest072 (157,439 points) 60 409 933

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

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