At 1, 2, 3 If there are p prime numbers, Q composite numbers, m odd numbers and n even numbers, then (P-M) + (q-n)=______ .

At 1, 2, 3 If there are p prime numbers, Q composite numbers, m odd numbers and n even numbers, then (P-M) + (q-n)=______ .

P + q = n-1, M + n = n, then (P-M) + (q-n), = P-M + q-n, = (P + Q) - (M + n), = (n-1) - N, = - 1