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Verified answer
Jawab1 + 3 + 5 + ....+(2n -1)
a = 1
un = 2n-1
sn = n/2 (a + un)
sn = n/2 (1 + 2n-1)
sn = n/2 (2n)
sn = n²
Notasi sigma
k
Σ (2k-1) = k²
1