Mathc initiation/a159

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	fb.h

/* --------------------------------- */
/* save as fb.h                      */
/* --------------------------------- */
double F_pls1(
double n)
{
        return(  factorial(n+1));
}
char  eqF_pls1[] = "(n+1)!";
/* --------------------------------- */
double F_pls1_a(
double n)
{
        return( (n+1) * n * factorial(n-1));
}
char  eqF_pls1_a[] = "(n+1) n (n–1)!";
/* --------------------------------- */
double F_pls1_b(
double n)
{
        return( (n*n+n) * factorial(n-1));
}
char  eqF_pls1_b[] = "(n**2+n) (n–1)!";
/* --------------------------------- */
/* --------------------------------- */