code: public static double estimateFalsePositiveProbability(long inputEntries, int bitSize) {
  		int numFunction = optimalNumOfHashFunctions(inputEntries, bitSize);
  		double p = Math.pow(Math.E, -(double) numFunction * inputEntries / bitSize);
  		double estimatedFPP = Math.pow(1 - p, numFunction);
  		return estimatedFPP;
  	}
docs: Compute the false positive probability based on given input entries and bits size.
  Note: this is just the math expected value, you should not expect the fpp in real case would under the return value for certain.
  
  @param inputEntries
  @param bitSize
  @return