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 , ?  , 257

Take difference between given  number

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 ......

Then 44 + 26 = 70

so our series

7, 17 , 41, 85, 155 , 257

= 155 Ans

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##### Raj

2 years, 4 months ago

Solutions view

2 years ago

7,17,41,85,?,257

##### RISHABH KURMI

2 years, 3 months ago

Solution explained

##### Sanu

2 years, 3 months ago

Solution

##### Sanu

2 years, 3 months ago

7,17,41,85,_,257

##### abel abel

2 years, 3 months ago

Solution ?

##### ASHU SINGH

2 years, 3 months ago

Solution

OR