Question

Дана ариф­ме­ти­че­ская про­грес­сия: 11, 7, 3, ... . Какое число стоит в этой по­сле­до­ва­тель­но­сти на 7-м месте?

Answer 1

Число -13 находится на 7 месте в данной последовательности.

А1 = 11 
A2 = 7
A3 = 3
A4 = -1
A5 = -5
A6 = -9
A7 = -13

Answer 2

Arithmetic Progression

The given arithmetic progression is 11, 7, 3, ... and we need to find the number at the 7th position.

To find the number at the 7th position 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 - d is the common difference

In this case, the first term (a₁) is 11, the common difference (d) is -4 (since each term decreases by 4), and we want to find the 7th term (n = 7).

Using the formula: a₇ = 11 + (7 - 1)(-4)

This gives us: a₇ = 11 + 6(-4) = 11 - 24 = -13

So, the number at the 7th position in the given arithmetic progression is -13.