Pl-z help aswer which one you want but plzz just want help

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Which statement is not always true for a parallelogram? (a) opposite sides are congruent. (b) diagonals bisect each other. (c) it has 4 congruent angles. (d) consecutive angles are supplementary.

Will give brainliest what is the value of x? enter your answer in the box.

Which of the following is the result of expanding the series