Question : Directions: Select the number from among the given options that can replace the question mark (?) in the following series.
183, 173, 153, 123, 83, ?
Option 1: 43
Option 2: 33
Option 3: 23
Option 4: 53
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Correct Answer: 33
Solution :
Given:
183, 173, 153, 123, 83, ?
Subtract multiples of 10 to the previous number to obtain the next number.
183 – 10 = 173, 173 – 20 = 153, 153 – 30 = 123, 123 – 40 = 83, 83 – 50 = 33
So, the missing number is 33. Hence, the second option is correct.
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