Teaching BPSC बिहार प्राथमिक (1 to 5) शिक्षक भर्ती 4.0 Mock Test Quantitative Aptitude Algebra

If x = 1 + √2 and y = 1 - √2, then what will be the value of x ^{- 2} + y ^{- 2}?

1

8

2

4

3

6

4

More than one of the above

5

None of the above

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