Yes - 28 is equal to 1 + 2 + 3 + 4 + 5 + 6 + 7.
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no- 29 is not triangular. The triangular numbers closest to 29 are 28 and 36.
28"21" but to be extra smart the answer is "The seventh triangular number is twenty one."
No - but it is a square number. 1,3,6,10,15,21 & 28 are all triangular numbers. 1,4,9,16,25 & 36 are all square numbers.
There is a very simple formula. The nth triangular number, T(n) = n*(n+1)/2Here n = 7, so T(7) = 7*8/2 = 28.
No. The first few triangular numbers are 1, 3, 6, 10, 15, 21, 28, ...