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What should come in place of the question mark (?) in the given series? 105, 155, 196, 228, 251, ?
Question

What should come in place of the question mark (?) in the given series?
105, 155, 196, 228, 251, ?

A.

258

B.

265

C.

280

D.

272

Correct option is B

Given: 105, 155, 196, 228, 251, ?
Logic: The number added each time decreases by 9: 50, 41, 32, 23, and then 14.The 
double difference decreased by 9.
105 + 50 = 155
155 + 41 = 196
196 + 32 = 228
228 + 23 = 251
251 + 14 = 265
So, the next number is 251 + 14 = 265.
Thus, the correct option is (b) 265

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