Question

the sum of 7th and 8th triangular number is ___​

Answer 1

The sum of the 7th and 8th triangular numbers is 64

What are triangular numbers?

• The triangular number sequences are used to show the numbers in the form of an equilateral triangle ordered in a sequence or series.
  
  
• The triangular number sequence is given: 1, 3, 6, 10, 15, 21, 28, 36, 45, and so on.
  
  
• The 7th number is 28 while the 8th number is 36.
  
  
• Thus, their sum total: 28 + 36 = 64

#SPJ3