Question : Directions: In the following question, select the missing number of the given series. 55, 38, 21, 4, –13, ?
Option 1: –30
Option 2: –20
Option 3: –28
Option 4: –18
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Correct Answer: –30
Solution : Given: 55, 38, 21, 4, –13, ?
Subtract 17 from the previous number, to obtain the next number of the series – 55 – 17 = 38; 38 – 17 = 21; 21 – 17 = 4; 4 – 17 = –13; –13 – 17 = –30
So, –30 is the missing number of the series. Hence, the first option is correct.
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