Identify the term that will replace the ?
$55, 45, 36, 28, 21, ?$

11

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16

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15

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17

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Solution

The correct option is C $15$
The series is $- 10, - 9, - 8, - 7, - 6$ .
$x - 21 = - 6$
$x = 15$
So, option C is the correct answer.

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