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What is x for the sequence 4, 9 , 25, 49, x, 169, 289, 361?

Correct Answer:

**A**This is a probability without replacement problem

- The numbers in the sequence are all perfect squares.
- Take the square root of each number in the sequence:

2, 3, 5, 7, square root of x, 13, 17, 19 - These numbers are all primes. The sequence is the list of primes squared
- This means that x is 11
^{2}= 121