Question

Pls answerrrrr
with simple working

Answer 1

Question: Is -451 in the sequence bellow?

15, 7, -1, -9, -17, ...

-451 not in the sequence

Numerical sequence

This question involves the concepts of arithmetic progression.

Which consists of adding the previous term to a certain ratio (r), which will be found the next term.

Let's see

Data to calculate

r = 7-15=-8

an = -451

a1= 15

n=?

`\begin{array}{l}\sf a_(n) = a_(1) + ( n-1 )r\\\sf -451 = 15 + ( n-1 )*(-8)\\\sf -451=15-8x+8\\\sf -451 = 23-8n\\\sf 8n=23+451\\\sf 8n=474\\\sf n=(474)/(8)\\\sf n=59{,}25\end{array}`

The result is not an integer, so -451 is not part of the sequence

Answer 2

the answer is no, i just checked the calculator and it only reaches to -457. so close