Question

A1=13, a5=18, d=? Геометрическое прогрессия

Answer 1

Ответ:

(18-13)/(5-1)=5/4

d=1,25

Пошаговое объяснение:

по формуле нахождения d

(an-a1)/(n-1)

Answer 2

Based on the given information, it seems like you are referring to an arithmetic progression (AP), not a geometric progression (GP). In an arithmetic progression, the difference between consecutive terms remains constant.

To find the common difference (d) in the arithmetic progression, we can use the formula:

aₙ = a₁ + (n - 1)d

Where: aₙ is the nth term, a₁ is the first term, n is the position of the term in the sequence, d is the common difference.

Using the given information, we have: a₁ = 13 (first term) a₅ = 18 (fifth term) n = 5 (position of the term)

Substituting these values into the formula:

18 = 13 + (5 - 1)d

Simplifying the equation:

18 = 13 + 4d

Subtracting 13 from both sides:

5 = 4d

Dividing both sides by 4:

d = 5/4 = 1.25

Therefore, the common difference (d) in the arithmetic progression is 1.25.