also looking for the X in this sequence:
7-5-4-8-6-3-15-11-X
there is a logic to it but I can't find it
and also this sequence:
992-101-496-55-X-32-124-16

Question

anonymous · Answer

Should be 7 for the first sequence.

anonymous · Answer

7+8=15
5+6=11
4+3=7

anonymous · Answer

Is the second number in the second sequence supposed to be 110?

anonymous · Answer

no it's 101...

anonymous · Answer

If it is, X should be 248.

anonymous · Answer

The secondary sequence doesn't make sense. The paired sets 992/2 =496
496/2=248
248/2=124

anonymous · Answer

101-55-32-16
I can't do much with those. 110 would be 55*2 and 32 is 16*2.

anonymous · Answer

that was my first idea as well but in all other sequences all numbers are used... with this logic it could be an error in the question...

anonymous · Answer

I'd lean towards a typo, but there is the gap from 55 to 32 as well.

anonymous · Answer

Maybe someone else can find something. Sorry :)

anonymous · Answer

thanks for trying!