Question : Directions: Select the number from among the given options that can replace the question mark (?) in the following series. 72, 66, 63, 57, 54, 48, ?
Option 1: 58
Option 2: 39
Option 3: 45
Option 4: 43
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Correct Answer: 45
Solution : Given: 72, 66, 63, 57, 54, 48, ?
Subtract 6 and 3 alternately from the given numbers to obtain the next number. 72 – 6 = 66; 66 – 3 = 63; 63 – 6 = 57; 57 – 3 = 54; 54 – 6 = 48; 48 – 3 = 45
So, the missing number in the series is 45. Hence, the third option is correct.
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