How many 7's are present in the following sequence of numbers which are both preceded and followed by perfect square numbers?
1 2 3 7 9 7 4 3 6 9 7 2 1 7 4 9 5 2 5 4 7 9 5 2 9 7 1 4 7 1

This question was previously asked in
JKSSB SI Official Paper (Held On: 13 Dec 2022 Shift 1)
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  1. 2
  2. 3
  3. 5
  4. 4

Answer (Detailed Solution Below)

Option 3 : 5
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Detailed Solution

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Given series: 1 2 3 7 9 7 4 3 6 9 7 2 1 7 4 9 5 2 5 4 7 9 5 2 9 7 1 4 7 1

According to the question, such '7' which are immediately preceded and followed by perfect square numbers:

Required condition: Square number - 7 - Square number

1 2 3 7 9 7 4 3 6 9 7 2 1 7 4 9 5 2 5 4 7 9 5 2 9 7 1 4 7 1

Thus, there are five such '7' which are immediately preceded and followed by perfect square numbers.

Hence, "Option 3" is the correct answer.

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