Any filter extension

EnumerableAnyExtensions.cs

using System;
using System.Collections.Generic;
using System.Linq;

namespace Sample {
    public static class EnumerableAnyExtensions {
        public static IEnumerable<TSource> WhereAny<TSource>(this IEnumerable<TSource> inSelf, params Func<TSource, bool>[] inFilters) {
            return inSelf.Where(
                source => inFilters.Any(fn => fn(source))
            );
        }

        public static int CountAny<TSource>(this IEnumerable<TSource> inSelf, params Func<TSource, bool>[] inFilters) {
            return inSelf.Count(
                source => inFilters.Any(fn => fn(source))
            );
        }
    }
}

EnumerableAnyExtensions.Test.cs

using System;
using System.Collections.Generic;
using System.Linq;

using NUnit.Framework;

namespace Sample {
    [TestFixture]
    public class EnumerableTest {
       [Test]
        public void _2か3どちらかの倍数() {
            var count = Enumerable.Range(1, 10)
                .CountAny(
                    i => i % 2 == 0, 
                    i => i % 3 == 0
                );

            Assert.That(count, Is.EqualTo(7));
        }
    }
}