Question

Tolong disertai jawaban lengkap nya..(dalam bentuk lampiran)..ty

Answer 1

Verified answer

jawab

1 x 3 = 1 (2 + 1 )= 1 (2.1 + 1)

2x 5 = 2(4 + 1) = 2 (2.2 + 1)

3 x 7 = 3 (6 + 1) = 3 (2.3 + 1)

4 x 9 = 4 (8+ 1) = 4 (2.4) + 1

..

untuk suku ke n = n (2n +1)

sigma nya

4

sigma k (2k + 1)

k = 1