Question

answer please only of u know​

Answer 1

Answer:

Step-by-step explanation:

Let p = 1

S1 = a + b

S2 = 4 a +2 b

a1 = S1

a2 = S2 - S1 = 3a + b

d = a2 - a1

=3 a + b - (a + b)

= 2a

Answer 2

Answer:

Sp = ap∧2 + bp

S1 = a + b

S2 = 4a + 2b

common difference = S2 - S1

                                  = 4a + 2b - a - b

                                  =  3a + b