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added 41 characters in body

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edited Dec 21, 2021 at 1:41

Pari/GP, 45 bytes

(a,b,c)->sum(i=0,(#a-1)/b,a[b*i+1,c*i%#a~+1])

(a,b,c)->sum(i=0,(#a-1)/b,a[b*i+1,c*i%#a~+1])

(a,b,c)->sum(i=0,(#a-1)/b,a[b*i+1,c*i%#a~+1])

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created Dec 21, 2021 at 0:58

(a,b,c)->sum(i=0,(#a-1)/b,a[b*i+1,c*i%#a~+1])