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What comes next in the sequence; 6, 13, 25, 51, 101, ?, ?

+1 vote
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What comes next in the sequence; 6, 13, 25, 51, 101, ?, ?
posted Mar 2, 2017 by Aarati Mahajan

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3 Answers

+1 vote

Thanks for the query.

If we take a number as x then it's continuing like 2x +1 when the number goes to an even place and 2x -1 when the number goes an odd place.

So, when we put x = 6 it continues like 2*6 + 1 = 13
Then it goes on like 2*13 - 1 = 25.
Then 2*25 + 1 = 51
Then 2*51 - 1 = 101
Then 2*101 +1 = 203
Then 2*203 - 1 = 405

So, the answer is 203 and 405.

answer Mar 2, 2017 by Arghyadeep Dutt Shrivastava
0 votes

6*2+1=13
13*2-1=25
25*2+1=51
51*2-1=101
101*2+1=203
203*2-1=405

answer Mar 19, 2017 by Deepak Mishra
–1 vote

Here 6, 13, 25, 51, 101, ?, ?
hence
6*2=12+1=13
13*2=26-1=25
25*2=50+1=51
51*2=102-1=101
101*2=202+1=203

answer Mar 2, 2017 by anonymous
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