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10 cards from this deck
A constant difference between consecutive terms.
It is denoted by aaa.
ddd denotes the common difference.
It is a,a+d,a+2d,...a, a + d, a + 2d, ...a,a+d,a+2d,...
an=a+(n−1)da_n = a + (n - 1)dan=a+(n−1)d.
Sn=n/2∗(2a+(n−1)d)S_n = n/2 * (2a + (n - 1)d)Sn=n/2∗(2a+(n−1)d).
Sn=n/2⋅(a+an)S_n = n/2 \cdot (a + a_n)Sn=n/2⋅(a+an).
a5=3+(5−1)×4=19a_5 = 3 + (5-1) \times 4 = 19a5=3+(5−1)×4=19.
nnn equals 5, the number of terms.
Sn=n/2∗(2a+(n−1)d)S_n = n/2 * (2a + (n-1)d)Sn=n/2∗(2a+(n−1)d) where aaa is the first term.
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