Untested, but should work:
{{ range $i,$p := where .Data.Pages "Section" "services" }}
{{if not (modBool $i 2)}}
it's odd
{{end}}
{{end}}
Untested, but should work:
{{ range $i,$p := where .Data.Pages "Section" "services" }}
{{if not (modBool $i 2)}}
it's odd
{{end}}
{{end}}