Jawaban:
Ada 54 Bola di pola ke 9
dan Ada 350 bola di pola ke 25
Penjelasan dengan langkah-langkah:
DIKETAHUI:
U1 = 2 = 1 + 2
U2 = 5 = 1 + 2 + 3 - 1
U3 = 9 = 1 + 2 + 3 + 4 - 1
= Un = ((n+1)(n + 1 + 1))/2 - 1
= Un = (n+1)(n+2)/2 - 1
= U9 = (9+1)(9+2)/2 - 1
= U9 = (10)(11)/2 - 1
= U9 = 55 - 1
= U9 = 54
= U25 = (25+1)(25+2)/2 - 1
= U25 = (26)(27)/2 - 1
= U25 = 351-1
= U25 = 350
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Jawaban:
Ada 54 Bola di pola ke 9
dan Ada 350 bola di pola ke 25
Penjelasan dengan langkah-langkah:
DIKETAHUI:
U1 = 2 = 1 + 2
U2 = 5 = 1 + 2 + 3 - 1
U3 = 9 = 1 + 2 + 3 + 4 - 1
= Un = ((n+1)(n + 1 + 1))/2 - 1
= Un = (n+1)(n+2)/2 - 1
= U9 = (9+1)(9+2)/2 - 1
= U9 = (10)(11)/2 - 1
= U9 = 55 - 1
= U9 = 54
= U25 = (25+1)(25+2)/2 - 1
= U25 = (26)(27)/2 - 1
= U25 = 351-1
= U25 = 350