5m Zen
S n 2 2a
S n 2 2a pictures 5
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S n
S n 2 2a
s n 2 2a n 1 d despejar d
prove s n 2 2a n 1 d
s n 2 2a
s n 2 2a n 1 d solve for a
s n 2 2a n 1 d make a the subject of the formula
s n 2 2a n 1 d
