Question

The 2nd term and 6th term of an A.P. are 6 and 18 respectively. Find its
first term and common difference.
Find the AP whose th term is 25 and 19th term is 77. (U. P. 1968)​

Answer 1

Answer:1 st term-3 and common difference is 3

Step-by-step explanation:

Answer 2

Step-by-step explanation:

Q.(1)

ans: a(2) = 6

a + d = 6 ----(1)

a(6) = 18

a + 5d = 18 -----(2)

समी.(2) - (1) से

4d = 12

d = 3

a = 3

A.P. का first term (a) = 3

& common difference(d) = 3