What should come in place of the question mark (?) in the given series?
310, 311, 301, 303, 293, 296, 286, ?

310, 311, 301, 303, 293, 296, 286, ?

Logic:  Alternating between increasing numbers (+1, +2, +3, ...) And decreasing by 10 every time.

310 +1 → 311 

311 -10 → 301 

301 +2 → 303 

303 -10 → 293 

293 +3 → 296  

296 -10 → 286  

so the next increment should be +4

So, 286 + 4 = 290

Thus, the correct option is (c) 290.