Find the sum to n terms | 1.2 + 2.3 + 3.4 + 4.5 + ….. | Sequence and Series | NCERT | Std 11 | Maths

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Sequence and Series | NCERT | Maths
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Sir plz give ans for this
Find the sum of n term

soci
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Sir how to solve
Find the sum of N terms of following series

DRGyt
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Sir pls reply its urgent that's why I am commenting ... What if we do this sum 1.2+2.3+3.4+4.5+....n like the following
1.2 + 2.3+ 3.4+ 4.5 +...n
(1+2+3+4+...n) * (2+3+4+5+...n)
Now applying Sn= n/2(2a+(n-1)*d to get the sum of first series and also the second series similar way and we multiply the summation of both ? Is it correct ?

arkabhattacharya