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10 questions from this quiz
The sum of the first nnn terms
Sn=12n(a+ℓ)S_n = \frac{1}{2}n(a + \ell)Sn=21n(a+ℓ)
101
(a+ℓ)(a + \ell)(a+ℓ)
The sum becomes negative
When you know ddd but not ℓ\ellℓ
−6-6−6
Tn=a+(n−1)dT_n = a + (n-1)dTn=a+(n−1)d
Variables aaa and ddd
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