MCQ
If two numbers are $2$ and $6$ then find their arithmetic mean.
- A$3$
- ✓$4$
- C$5$
- D$8$
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$(A)$ Equation of ellipse is $x^2+2 y^2=2$
$(B)$ The foci of ellipse are $( \pm 1,0)$
$(C)$ Equation of ellipse is $x^2+2 y^2=4$
$(D)$ The foci of ellipse are $( \pm \sqrt{2}, 0)$