Question : Directions: Which of the following numbers will replace the question mark (?) in the given series?
25, 15, ?, −5, −15
Option 1: 20
Option 2: 5
Option 3: 10
Option 4: -1
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Correct Answer: 5
Solution :
Given:
25, 15, ?, −5, −15
Subtract 10 from the previous term to obtain the next term in the given series
−
25
− 10 = 15; 15
− 10 = 5, 5 − 10 = −5, −5
− 10 =
−15
So, 5 is the missing term in the series. Hence, the second option is correct.
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