Just some interesting code, for

Sum of Any N equals X

(function() {
    var sumOfAnyTwo = function(sum, operandsArr) {
        var oper1 = null,
            oper2 = null;
        
        for(var i = 0; i < operandsArr.length; i++) {
            for(var j = 0; j < operandsArr.length; j++) {
                if(j !== i) {
                    if(operandsArr[i] + operandsArr[j] === sum) {
                        return true;
                    }
                }
            }
        }
        return false;
    },
        // Better version
        sumOfAnyN = function(sum, n, operandsArr, prevValue) {
            var editedArr = null;
            if(typeof prevValue === 'undefined') {
                prevValue = 0;
            }
            n--;
            for(var i = 0; i < operandsArr.length; i++) {
                if(n > 0) {
                    // copy the array, and remove this item
                    if(sumOfAnyN(sum, n, editedArr = operandsArr.slice(), prevValue + editedArr.splice(i, 1)[0])) {
                        return true;
                    }
                } else if( prevValue + operandsArr[i] === sum ) {
                    return true;
                }
            }
            return false;
        };


    console.log(sumOfAnyN(20, 2, [8, 2, 29, 7, 10, 11, 1, 17, 14, 13]));
    console.log(sumOfAnyN(27, 4, [2, 29, 7, 11, 1, 13]));
    console.log(sumOfAnyN(33, 3, [8, 2, 29, 7, 10, 19, 21, 11, 1, 17, 14, 13]));
    console.log(sumOfAnyN(112, 2, [8, 2, 29, 7, 17, 14, 13, 55, 60, 43, 90, 1, 23, 89, 11]));
    console.log(sumOfAnyN(89, 4, [29, 7, 10, 11, 1, 17, 14, 13]));
}());