Math, asked by samson70, 1 year ago

if 7th term and 13th term of an AP be 34 and 64 then find its 18th term
plzz solve this auestion step by step in proper way fast i will mark you as brainlist

Answers

Answered by merida42

a+(n-1)d is the formula

7th term is 34 hence a+6d=34

13th term is 64 hence a + 12d =64

subtracting the two equations we get

6d=30 hence d =5

hence a=4

hence 18 th term is

4+(18-1)5=89

samson70: plzz solve it properly then only i will mark you as brainlist

merida42: i didnt get you

samson70: you know how to talk in hindi

merida42: T7 = 34
=> a+6d = 34------(1)

T13 = 64
=> a+12d = 64 ------(2)

On subtracting equation 1 from 2, we get
6d = 30
=> d = 5

a = 4

T18 = a+17d
= 4+ 17*5
= 4+85
= 89

merida42: no i dont

samson70: i am. kt understanding this method

merida42: a+6d=34
a+12d=64
so
6d=30
d=5,a=4
then
18th term =4 +17*5=89

samson70: no

merida42: i dont want to be marked as the brainliest

samson70: ok dont

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if 7th term and 13th term of an AP be 34 and 64 then find its 18th term plzz solve this auestion step by step in proper way fast i will mark you as brainlist

Answers

if 7th term and 13th term of an AP be 34 and 64 then find its 18th term
plzz solve this auestion step by step in proper way fast i will mark you as brainlist