Question

find the difference between 30th and 20th terms of AP 2,712,17,22​

Answer 1

Answer:

a=2,d=5

a30=2+(30-1)5

a30=2+29(5)

a30=2+145

a30=147

a20=2+(20-1)5

a20=2+19(5)

a20=2+95

a20=97

a30-a20=147-97

=50

Difference between a30 and a20 is 50

Answer 2

Answer:

$\huge\underbrace\mathfrak\red{Answer:-}$

Given AP: 7,12,17,22.....

Here first term a=7 and common difference d=12−7=5

Since, a

n

=a+(n−1)d

⇒a

n

=7+(n−1)5

⇒a

n

=5n+2

nth term is 5n+2

∴ Option C is correct.

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