Some More Interesting Patterns#!#Triangular numbers

The numbers 1,3,6,10,15,21,28."……" are called triangular numbers. Let t_(n) denotes the bth triangular number such that t_(n)=t_(n-1)+n,AA n ge 2 . If (m+1) is the nth triangular number, then (n-m) is

If the least number of zeroes in a lower triangular matrix is 10, then what is the order of the matrix ?

Which of the following is not a Triangular number?

The sum of two consecutive triangular numbers is a square number.

Recap|Patterns In Whole Numbers|OMR

1,3,6,10…..are triangular numbers . The smallest triangular number that exactly divisible by 9 is .

Which has more vertices : a triangular prism or a square pyramid ?