exam Maths Puzzle Numerical Ability

please help me solve this question (-4e-9=19)

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exam Other Question

For any chi-square goodness-of-fit problem, the number of degrees of freedom is found by
A) n � k � 1.
B) k � 1.
C) n + 1.
D) n + k.
E) none of the above. |8x-3|=5