1 is the answer of ur question
but if it's from 1+2+3+4......+100 the answer is add 1+100,2+99....100+1 it's 5050 because n=100
so Sn=N/2*a+l
=100/2*1+100
=50*101=5050
i hope this helps u
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Answers & Comments
1 is the answer of ur question
but if it's from 1+2+3+4......+100 the answer is add 1+100,2+99....100+1 it's 5050 because n=100
so Sn=N/2*a+l
=100/2*1+100
=50*101=5050
i hope this helps u