def nCr_mod_p(n, r, p): 
	if (r > n- r): 
		r = n - r 
	C = [0 for i in range(r + 1)] 
	C[0] = 1 
	for i in range(1, n + 1): 
		for j in range(min(i, r), 0, -1): 
			C[j] = (C[j] + C[j-1]) % p 
	return C[r] 