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Insert the missing number in the given series

Insert the missing number in the given series: 165,195,255,285,345,(.......) The options given are : A.375 B.420 C.435 D.390

Your Answer

(A) is the correct option.

clearly,
195-165=30
255-195=60
285-255=30
345-285=60
therefore if the next number is x, then
x-345=30
i.e., x=345+30=375
hence, the ans is 375.

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