Exams › SSC CGL (Prelims) › General

If y + 1/y = 5, what is the value of y^2 + 1/y^2?

1. 21
2. 23
3. 25
4. 27

Correct answer: 23

Solution

Squaring y + 1/y = 5 gives y^2 + 2 + 1/y^2 = 25. Subtracting the middle term 2 leaves y^2 + 1/y^2 = 23.

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