Question

complete a sequência de números triangulares (1, 3, ...., 10, ...., ...., 28, ...., ....)​

Answer 1

1,3,6,10,15,21,28,36,45

espero ter ajudado!!

Answer 2

resolução!

Tn = n ( n + 1 ) / 2

T1 = 1

T2 = 3

T3 = 3 ( 3 + 1 ) / 2

T3 = 3 * 4 / 2

T3 = 12/2

T3 = 6

T4 = 10

T5 = 5 ( 5 + 1 ) / 2

T5 = 5 * 6 / 2

T5 = 30/2

T5 = 15

T6 = 6 ( 6 + 1 ) / 2

T6 = 6 * 7 / 2

T6 = 42/2

T6 = 21

T7 = 28

T8 = 8 ( 8 + 1 ) / 2

T8 = 8 * 9 / 2

T8 = 72/2

T8 = 36

T9 = 9 ( 9 + 1 ) / 2

T9 = 9 * 10 / 2

T9 = 90/2

T9 = 45

S = { 1 , 3 , 6 , 10 , 15 , 21 , 28 , 36 , 45 }