Question

plesee ans the above que

Answer 1

hi,

let a and d are first term and common difference of an A.P.

nth term = a+(n-1)d ---------(1)

i} given t 5= 19

a+4d =19 -------(2)

ii} difference of the 18th term from

the 13th term= 20

t 13 - t 8 = 20

a+12d-a-7d=20
5d=20
d=20/5
d=4

put d=4 in (2)

a+4d=19
a+4×4=19
a+16=19
a= 3

therefore,
a= 3 , d=5

required A.P is

a, a+d ,a+2d , a+3d , .............

3, 8 , 13 , 18 , 23 , .........

I hope this is useful to you.

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