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

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