YeshaKira
05.08.2021 •
Mathematics
Write the sum using the summation notation assuming the suggested pattern continues 2, -10, 50, -250, +… Is this sequence arithmetic or geometric? How do you know?
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Ответ:
geometric
x=number of terms
∑ 2(-5)^(k-1)
k=1
Step-by-step explanation:
the sequence has a ratio of -5 (2*-5=-10, -10*-5=50)
x=number of terms
∑ 2(-5)^(k-1)
k=1
for this i don't know what the last term is since it doesn't show in the question but just find 2(-5)^x and x will be the top term
Ответ:
Because you have to cross multiple