Question

If sn=n (n÷5)then find first three term​

Answer 1

Answer:

$\frac{1}{5} \: \: \: \: \: \frac{3}{5} \: \: \: \: \: 1$

Step-by-step explanation:

Sn = n(n÷5)

S1 = 1(1/5) = 1/5

S2 = 2(2/5) = 4/5

S3 = 3(3/5) = 9/5

S1 = a1 = 1/5

S2 = a1 + a2 = 1/5 + a2 = 4/5

a2 = 4/5 - 1/5 = 3/5

S3 = a1 + a2 + a3 = 9/5

1/5 + 3/5 + a3 = 9/5

a3 = 9/5 - 4/5 = 5/5 = 1

therefore

a1 = 1/5

a2 = 3/5

a3 = 5/5

A P is 1/5, 3/5, 1