Question

s11=363,a11=48, find a17

Answer 1

Answer:

here's your answer

Step-by-step explanation:

we know s11 = 11/2 ( 2a + 10d )

363 = 11/2 ( 2a + 10d )

2a + 10d = 66

a + 5d = 33

mark it as equation 1

also given that

a11 = 48

a + 10d = 48

mark it as eq. 2

subtract eq 1 from equation 2

a + 10d - a - 5d = 15

5d = 15

d =3 ( ans )

now put d = 3 in any of the equations you will get the answer

a = 33 - 15

a = 18 ( ans )