mathematical induction 1+2+3+....+n=1/2(n+1) prove that (answer assignment)
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Sn=n/2(2a+(n-1)d)
n/2(2a+(n-1)d)=1/2(n+1)
this will give you an hint to solve
other formulas are
Sn=n/2(a+l)
were l is An
sum of 1st n natural numbers
Sn=n(n+1)/2
n/2(2a+(n-1)d)=1/2(n+1)
this will give you an hint to solve
other formulas are
Sn=n/2(a+l)
were l is An
sum of 1st n natural numbers
Sn=n(n+1)/2
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