1.-
a)
F(n,m) {
	if ( n == 1|| m == 1) {
		return 1;
	}
	if ( n < m ) {
		return 0;
	}
	if ( n == m ) {
		return ( F( n , n – 1) + 1 );
	}
return ( F( n,  m – 1) + F( n – m, m ) );
}