Question

Find the 15th term from the end of the ap 4,9,14.........254

Answer 1

Answer:

74

Step-by-step explanation:

first term(a) = 4

common difference(d) = 5    (9-4=5)

15th term = a+ (n-1)d

= 4+ (14*5)

= 4+70

= 74

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Answer 2

Answer:

184

Step-by-step explanation:

Since the AP is considered from the end, therefore 254 becomes the first term.

common difference = -d = -5    #the original AP has d = 9-4 = 5

therefore

an = a+ n-1 * d

    = 254 + (15-1) * -5

    = 254 + 14*-5

    = 184