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suku ke-20 = 20² = 400
b. p15 = 225
p20 = 400
p25 = 625
p15 + p20 = 225 + 400 = 625
c. Pn = 729
Pn = 9²
n = 9
d.
e. = 1 3 5 7 9 11 13 16 15 17 = 81