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?

A geometric progression (GP) consists of 200 terms. If the sum of odd terms of the GP is m, and the sum of even terms of the GP is n, then what is its common ratio?

What is the value of 1 $$-$$ 2 + 3 $$-$$ 4 + 5 $$-$$ ......... + 101?