Question

Find the second last term in AP 3 7 11 15.....75

Answer 1

Answer:

Step-by-step explanation:

D=4

Last term 75

2nd last term=75-4=71

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Answer 2

Answer:

71

Step-by-step explanation:

3, 7, 11, 15, ............75

a = 3

d = 7 - 3 = 4

an = 75

an = a + (n - 1)d

75 = 3 + (n - 1)4

72 = (n - 1)4

18 = n - 1

n = 19

If the last term is 19th then second last term is 18th

a18 = a+ 17d

a18 = 3 + 17(4)

a18 = 3 + 68

a18 = 71

Therefore the second last term is 71