Question

(5.) 7, 31, 211,...
(1) 2311
(3) 2561
(2) 2211
(4) 2781

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Answer 1

2311 would be the next answer in the series because the first term is 7 , and 2+3+1+1 = 7

While the middle terms sum up to be 4 , i.e -

3+1=4

and ,

2+1+1=4