How many two-digit numbers are divisible by 4?

If the sum of first n terms of a series is (n + 12), then what is its third term?

Let a, b, c be in AP and k $$\ne$$ 0 be a real number. Which of the following are correct?

1. ka, kb, kc are in AP

2. k $$-$$ a, k $$-$$ b, k $$-$$ c are in AP

3. $${a \over k}$$, $${b \over k}$$, $${c \over k}$$ are in AP

Select the correct answer using the code given below.

Let m and n(m < n) be the roots of the equation x² $$-$$ 16x + 39 = 0. If four terms p, q, r and s are inserted between m and n to form an AP, then what is the value of p + q + r + s?