The sum of all natural numbers from 1 to 25
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sum of all natural numbers is equal to n(n+1)/2
sum of first 25 natural numbers is equal to 25(25+1)/2
sum of first 25 natural numbers is equal to 25×13
sum of first 25 natural numbers is equal to 325
sum of first 25 natural numbers is equal to 25(25+1)/2
sum of first 25 natural numbers is equal to 25×13
sum of first 25 natural numbers is equal to 325
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a=1
d=1
Sn= n/2(2a+(n-1)d)
=25/2(2×1+(25-1)1)
=25/2(26)
=25×13
=325
that's it.....
d=1
Sn= n/2(2a+(n-1)d)
=25/2(2×1+(25-1)1)
=25/2(26)
=25×13
=325
that's it.....
sargamkashyap:
its 450
sorry by mistake i wrote it 45
now thats fine
25×13=325
ya ya tq
welcome
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