Third term of an A.P is 17 and the 10th term is 50 less than the 20th term. Form the A.P
a3 = 17
a + 2d = 17 .................... ( 1 )
a10 = a20 - 50
a + 9d = a + 19d - 50
50 = 10d
d = 5 ................... ( 2 )
a + 2d = 17
a + 10 = 17
a = 7
AP : 7 , 12 , 17, 22 . 27