Complete the following series:
$165, 195, 255, 285, 345, (. . . . . . . .)$

375

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420

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435

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390

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Solution

The correct option is A $375$
Series has the form
$165 + 30 = 195$
$195 + 60 = 255$
$255 + 30 = 285$
$285 + 60 = 345$
$345 + 30 = 375$
Hence $375$ replaces question mark.

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