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Available are: 1 4 3 1

Only P0 is satisfying , Now available is 1 4 5 2

Only P3 is satisfying, Now available is 1 11 9 4

Now either P2 or P4 any can go

if P2 goes: then P1 and P4 may follow any order : 2 sequences.

if P4 goes: then P1 and P2 may follow any order : 2 sequences.

Total 4 Sequences.

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bts1jimin asked Sep 8, 2018
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What is sum of the following series1+ √2+ √3 +√4.....+√n ?Asymptotic answer will be okay too.