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20. All numbers have only one similar vowel: E.
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it can be this way..... 3 7 10 11 12 17 ?? +4 +3 +1 +1 +5 ?4-3=11-x=5so x=-4so the next number is 13
one also has e but it is not mentioned.....
The numbers given are in increasing order. So please keep that in mind.
add alternative numbers and subtract with one will give the 2nd value of the series..3,7,10,11,12,173+10-1=127+11-1=17so the next number will be 10+12-1=21