Question

Which of the following numbers is a square number as well as a triangular number?
(1) 64 (2) 36 (3) 25 (4) 9​

Answer 1

$\large\mathbf\red{ANSWER \: :}$

Your answer is 36.

$\longrightarrow$ Since, 36 is the square of 6 and also a triangular number.