Question

Find th value of a30-a20. Ap 2,7,12,17....?

Answer 1

Answer:

50

Step-by-step explanation:

A.P. =  2,7,12,17....

A = first term = 2

Common difference = d = $a_2-a_1 =a_3-a_2=7-2=12-7 =5$

Formula of nth term = $a_n=a+(n-1)d$

Substitute n = 30

$a_{30}=2+(30-1)(5)$

$a_{30}=147$

Substitute n  = 20

$a_{20}=2+(20-1)(5)$

$a_{20}=97$

So, $a_{30}-a_{20}=147-97=50$

Hence the value of  $a_{30}-a_{20}=50$

Answer 2

Step-by-step explanation:

a=2,. d=5

a30=a+29d

a20=a+19d

a30-a19= a+29d-(a+19d)

=2+29×5-2+19×5

=2+145 - 2+95

=147-97

=50

i hope understand