What should come in place of the question mark (?) in the given series?
127, 257, 407, 577, 767, ?
Show answer & explanation
Correct answer: D
Explanation
The correct answer is option 4 i.e. 977.
Given: 127, 257, 407, 577, 767, ?
127 + 130 = 257
257 + 150 = 407
407 + 170 = 577
577 + 190 = 767
767 + 210 = 977