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an = -5 • 5n
an = 5 • -5n + 1
an = 5 • -5n
an = -5 • 5n - 1

this is a geometric progression with a=-5
r=5
cant u proceed from there?

nth term of gp=ar^n-1
here -5(5)^(n-1)

so the last option?

yep

thank you :)