State the 5th and 6th terms of triangular numbers. What square number will we get if we add these two numbers?

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Solution

The triangular number is given by
$x_{n} = \frac{n (n + 1)}{2}$
So 5th number will be 15
6th number will be 21
We will get square of 9.

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State the 5th and 6th terms of triangular numbers. What square number will we get if we add these two numbers?

The triangular number is given by xn=n(n+1)2 So 5th number will be 15 6th number will be 21 We will get square of 9.

The triangular number is given by
$x_{n} = \frac{n (n + 1)}{2}$
So 5th number will be 15
6th number will be 21
We will get square of 9.