Question

Find the 25th term of the A.P.-5,-52,0,5/2…?

5b85f3ebeefb8a5ab7e43050ef042b40.pdf

Answer 1

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Answer 2

a25 = ?

a1 = - 5

a2 = - 5/2

a3 = 0

a4 = 5/2

Here, to find d,

d = a2 - a1

d = -5/2 - (-5)

d = -5/2 + 5

d = ( - 5 + 10)/2

d = 5/2

Therefore,

a1 = - 5, d = 5/2, n = 25

an = a+ ( n-1) d

a25 = - 5 + (25 - 1) 5/2

a25 = - 5+ ( 24) 5/2

a25 = - 5 + 12* 5

a25 = -5 + 60

a25 = 55

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