Which of the following numbers is a triangular number with its square ending with 4?

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Solution

The correct option is D
28

From amongst the given four options, 6 and 28 are triangular numbers.

Now, the number 28 has 8 at its unit's place, so its square ends with 4.

Thus, 28 is the required triangular number with its square ending with 4.

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Similar questions

Which of the following numbers is a square as well as a triangular number?

A number ending with 1 or 9 will always have its square ending with 1.

Statement 1: Square numbers can never end with 2, 3, 7 or 8.

Statement 2: If a number ends with 0, 1, 4, 5, 6 or 9, it must be a square number.

Which of these statement(s) is/are right?

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