Java Guava | binomial(int n, int k) of LongMath Class with Examples

The binomial(int n, int k) method of Guava’s LongMath Class accepts two parameters n and k and calculate the value of the binomial coefficient . If the calculated value overflows the maximum value of a long, then the method returns Long.MAX_VALUE i.e, the maximum value of a long.

Syntax :

public static long binomial(int n, int k)

Parameters: This method accepts two parameters n and k and calculate the value of the binomial coefficient .

Return Value : The method returns the binomial coefficient of n and k.

Exceptions : The method binomial(int n, int k) throws IllegalArgumentException if n is negative, or k is negative or k is greater than n.

Below examples illustrate the binomial() method of LongMath class:

Example 1 :

 // Java code to show implementation of // binomial(int n, int k) method of Guava's // LongMath class import java.math.RoundingMode; import com.google.common.math.LongMath;    class GFG {        // Driver code     public static void main(String args[])     {         int n = 4;         int k = 3;            // Using binomial(int n, int k) method of         // Guava's LongMath class         long ans = LongMath.binomial(n, k);            System.out.println("Binomial Coefficient of "                            + n + " and " + k                            + " is : " + ans);            int n1 = 20;         int k1 = 4;            // Using binomial(int n, int k) method of         // Guava's LongMath class         long ans1 = LongMath.binomial(n1, k1);            System.out.println("Binomial Coefficient of "                            + n1 + " and " + k1                            + " is : " + ans1);     } }

Output:

Binomial Coefficient of 4 and 3 is : 4
Binomial Coefficient of 20 and 4 is : 4845

Example 2 :

 // Java code to show implementation of // binomial(int n, int k) method of Guava's // LongMath class    import java.math.RoundingMode; import com.google.common.math.LongMath;    class GFG {        static long findBinomial(int n, int k)     {         try {             // Using binomial(int n, int k)             // method of Guava's LongMath class             // This should throw "IllegalArgumentException"             // as k < 0             long ans = LongMath.binomial(n, k);                // Return the answer             return ans;         }         catch (Exception e) {             System.out.println(e);             return -1;         }     }        // Driver code     public static void main(String args[])     {         int n = 5;         int k = 7;            try {             // Function calling             findBinomial(n, k);         }         catch (Exception e) {             System.out.println(e);         }     } }

Output:

java.lang.IllegalArgumentException: k (7) > n (5)

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