Calculate the value of N in the given series and then find the value of x using the given equation.
99 163 N 248 273 289
If $\sqrt{2 N + 17} = X,$ then x equals

20.5

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21.5

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Solution

The correct option is D 21
In given series diffrence between Previous number and next number is square root of 8, 7,6,5 and 4
So N will be 212
Now As given $\sqrt{2 N + 17} = X$
$\sqrt{2 \times 212 + 17} = X$
$\sqrt{441} = X$
$x = 21.0$

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