Question

For an AP A5=17 and a=5 then find a9​

Answer 1

Answer:

here you go..

a5 = a+ (5-1) d

a5 = a +4d

as a = 5 .. as given... substituting

a5 = 17

17 = 5 + 4d

12 = 4d

d = 3

now, a9 = a+ (9-1) d

a9 = 5 + 8 (3)

a9 = 5 + 24

a9 = 29

hence, a9 = 29

hope it helps you

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