exam Maths Puzzle Numerical Ability

Which of the following polynomials is NOT a perfect square trinomial?

x2 + 2x + 1
4x2 - 4x + 1
x2 + 3x + 9
16x2 + 8x + 1
all of them are perfect square trinomials

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The combined resistance of two resistors R1 and R2 in a parallel circuit is given by the formula R=1/(1/R1+1/R2)
Simplify the formula.