text: /**
  * @license Apache-2.0
  *
  * Copyright (c) 2018 The Stdlib Authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
  *
  *    http://www.apache.org/licenses/LICENSE-2.0
  *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
  
  'use strict';
  
  // MODULES //
  
  var isNonNegativeInteger = require( '@stdlib/assert/is-nonnegative-integer' ).isPrimitive;
  
  
  // MAIN //
  
  /**
  * Validates parameters.
  *
  * @private
  * @param {NonNegativeInteger} N - population size
  * @param {NonNegativeInteger} K - subpopulation size
  * @param {NonNegativeInteger} n - number of draws
  * @returns {(Error|null)} error or null
  *
  * @example
  * var err = validate( 1, 2, 3 );
  * if ( err ) {
  *     throw err;
  * }
  */
  function validate( N, K, n ) {
  	if ( !isNonNegativeInteger( N ) ) {
  		return new TypeError( 'invalid argument. `N` must be a nonnegative integer. Value: `' + N + '`.' );
  	}
  	if ( !isNonNegativeInteger( K ) ) {
  		return new TypeError( 'invalid argument. `K` must be a nonnegative integer. Value: `' + K + '`.' );
  	}
  	if ( !isNonNegativeInteger( n ) ) {
  		return new TypeError( 'invalid argument. `n` must be a nonnegative integer. Value: `' + n + '`.' );
  	}
  	if ( n > N ) {
  		return new RangeError( 'invalid argument. `n` must be less than or equal to `N`. Value: `' + n + '`.' );
  	}
  	if ( K > N ) {
  		return new RangeError( 'invalid argument. `K` must be less than or equal to `N`. Value: `' + K + '`.' );
  	}
  	return null;
  }
  
  
  // EXPORTS //
  
  module.exports = validate;
  