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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

Hi Pooja!This is Neeraj Atluri.The missing number in the sequence is 
195-165=30
255-195=60
285-255=30
345-285=60
so the sequence  of difference between numbers varies by  30 and 60 in order.So the next upcoming number in the sequence is 345+30=375
Option "A"

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