Even term sum formula, odd term sum formula of arithmetic sequence Push to add result

a,a+b,a+2b,a+3b,a+4b,a+5b…… ,a+(n-1)b
1 2 3 4 5 6
Even number terms: a + B, a + 3b, a + 5b The first term is a + B and the difference is 2B
Then: and formula s=
Odd number terms: A, a + 2B, a + 4b , a + 2 (n-1) * B, that is, the arithmetic sequence with the first term a and the difference 2B
Then: and formula s=
I don't want to write the specific answers

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