Question : Directions: Select the number from among the given options that can replace the question mark (?) in the following series.
20, 110, 200, 290, 380, ?
Option 1: 470
Option 2: 490
Option 3: 460
Option 4: 480
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Correct Answer: 470
Solution :
Given:
20, 110, 200, 290, 380, ?
Add 90 to each number to get the next number of the series –
20 + 90 = 110; 110 + 90 = 200; 200 + 90 = 290; 290 + 90 = 380; 380 + 90 = 470
So, the missing number is 470. Hence, the first option is correct.
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