Missing numbers in sequence

1 __ 7.the numbers in this sequence increase by equal amount each time. Find the numbers?

Answers
The number is 4 as the sequence goes like this 1 4 7 so the difference between each two number is 3.Hence the number is 4
vikashrnjn290
19 December 2018
1  4   7  10
martinjames.1
28 December 2018
The number is 4 .. 1+3=44+3=7    
gajju365
29 December 2018
The answer is 4 since there will be a difference of 3 between 1 and 4 and a difference of 3 between 4 and 7.
Nuzra M.
30 December 2018
Annswer of this question is 4 because the difference of 3 between 1 and 4 and difference of 3 between 4 and 7  
rohit_kumar_patel
03 January 2019
The sequence would be 1,4,7.This is found out by finding the number in the middle of 1 and 7. The difference between 1 and 4 is 7, likewise the difference between 4 and 7 is 3.
Rhegan F.
04 January 2019
There is 3 possible sequences.They are1,2,3,4,5,6,7 difference is 11,3,5,7 difference is 21,4,7 difference is 3
ashoklella
05 January 2019
a=1  b=?  c=7b=a+b/2=1+7/2=8/2=4number is  41  4  7
nitheesh
05 January 2019
1,2,3,4,5,6,71,72,63,54x=4
bobby232
09 January 2019
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