Here there is series among series in a series
86-19 =67
67-18=49
49-16 =33
33-13 =20
20-9 =11
So, series in difference we have 19-1 =18
18-2 =16
16-3 =13
13-4 =9
So next term will be 11.
Alternative method:
Next term will be 11.
English
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