Question 9

# Select the option that will replace the question mark to complete the given series.7, 17, 41, 85, ?, 257

Solution

As per the given question,

7 , 17 , 41 , 85 , ?Â  ,Â 257

Take difference between givenÂ  numberÂ Â

17-7 = 10,

41 - 17 = 24,

85 - 41= 44

Hence, series will be as per the given,

10, 24, 44 .....

Again taking the difference of the given term of the series with the next term.

24 -10 =14,

44 - 24 = 20 .... as so on.

Hence the required series will be 14, 20, 26, 32 ......Â  Â  Â

Then 44 + 26 = 70

so our seriesÂ

7, 17 , 41, 85, 155 , 257Â Â  Â

= 155 Ans

• Free SSC Study Material - 18000 Questions
• 230+ SSC previous papers with solutions PDF

##### Raj

2Â years, 4Â months ago

Solutions view

2Â years ago

7,17,41,85,?,257

##### RISHABH KURMI

2Â years, 3Â months ago

Solution explained

##### Sanu

2Â years, 3Â months ago

Solution

##### Sanu

2Â years, 3Â months ago

7,17,41,85,_,257

##### abel abel

2Â years, 3Â months ago

Solution ?

##### ASHU SINGH

2Â years, 3Â months ago

Solution

OR