The triangular numbers are the following: T1 = 1, T2 = 3, T3 = 6, T4 = 10, ... They are called triangular numbers because you can think of the number as a series of dots which can be arranged into a triangle as shown below:
T1 =1
T2 = 3
T3=6
T4=10

The formula for the nth triangular number is Tn = n(n+1)/2. For example, the fourth triangular number is 10, so T4 = 10.

1953 is a triangular number. Which one is it?

For example, if 1953 happened to be the 4th triangular number (which of course it's not), your answer would be 4.

T62

Step-by-step explanation:

Tn = n(n + 1)/2

1953 = n(n + 1)/2

n(n + 1) = 3906

n^2 + n - 3906 = 0

(n + 63)(n - 62) = 0

n = -63 or n = 62

T62

step-by-step explanation:

and 90% of people marry there 7th grade love. since u have read this, u will be told good news 2night. if u don't pass this on nine comments ur worst week starts now this isn't fake. apparently if u copy and paste this on ten comments in the next ten minutes you will have the best day of ur life tomorrow. you will either get kissed or asked out in the next 53 minutes someone will say i love u

read more on -