Question

The sum of the ten terms of an AP is 50 and its fifth term is treble the second term. calculated the first term and the sum of first twenty terms​

Answer 1

Answer:

a= 1/2 and S20 = 200

Step-by-step explanation

a5 =3a2

a+4d = 3a +3d

d=2a

S10= 50 (given in question)

10/2 (2a+9d) = 50

2a+18a =10 {d=2a}

a=1/2

d=1

so S20 = 200