Question

what is the sum of first n
a)natural numbers
b)odd numbers
c)even numbers

Answer 1

sum of First n Natural Numbers. We prove the formula 1+ 2+ ... + n = n(n+1) / 2, for n a natural number

SUM OF EVEN NUMBERS: Formula: N(N+1)

SUM OF ODD NUMBERS: If N = number of odd terms then sum = (N)^2

Answer 2

Hope this helps you out...
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If you add two natural numbers, the answer itself is a natural number.
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There is also a prove formula of it 1+ 2+ .........(infinite numbers ) = n(n+1) / 2,


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If you add two even numbers , the answer is itself a even number.


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There is a formula formula: N(N+1)

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If you add two odd numbers the answer is itself odd
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There is a formula (N)^2 ( n here is number of odd terms )