MCQ
The distance between the points $(7, 5)$ and $(3, 2)$ is equal to ........... $\mathrm{unit}$
- A$2$
- B$3$
- C$4$
- ✓$5$
=$\sqrt {{{(3 - 7)}^2} + {{(2 - 5)}^2}} = \sqrt {16 + 9} = 5$ unit.
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Let $\mathrm{A}_{\mathrm{k}}=\mathrm{a}_1{ }^2-\mathrm{a}_2{ }^2+\mathrm{a}_3{ }^2-\mathrm{a}_4{ }^2+\ldots+\mathrm{a}_{2 \mathrm{k}-1}{ }^2-\mathrm{a}_{2 \mathrm{k}}{ }^2$.
If $\mathrm{A}_3=-153, \mathrm{~A}_5=-435$ and $\mathrm{a}_1{ }^2+\mathrm{a}_2{ }^2+\mathrm{a}_3{ }^2=66$, then $\mathrm{a}_{17}-\mathrm{A}_7$ is equal to....................