1
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Question

# If the positions of the first and the second digits of each of the numbers are interchanged, in how many numbers thus formed will the first digit be a perfect square? (‘1’ is also a perfect square)

A

One

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B

Two

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C

Three

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D

Four

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E

Five

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Solution

## The correct option is B Two Given that five three-digit numbers are: 356 497 812 739 264 The positions of the first and the second digits of each of the numbers after being interchanged are: 536 947 182 379 624 Given that ‘1’ is also a perfect square, so only in 947 and 147, the first digit is a perfect square.

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