165, 195, 255, 285, 345, ?

What will come at the place of question mark ?
165, 195, 255, 285, 345, ?

A. 390
B. 420
C. 435
D. 375
E. Two answer out of four option

Answer & Solution

Answer: Option E
Solution:

Solution 1: Each number of given series is 15 multiplied by a prime number.
15*11, 15*13, 15*17, 15*19, 15*23.
So, Missing number is
15*29 = 435.

Solution 2: This pattern is +30 and then +60 also follow for the give series.
165+30=195,
195+60=255,
255+30=285,
285+60=345,
345+30=375

165, 195, 255, 285, 345, ?

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