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Given AP: 3,6,9,12,...........330
First term a = 3
common difference d = 6 - 3 = 3
Now, 17th term = a + (17 - 1)d
=> 17th term = a + 16d
=> 17th term = 3 + 16*3
=> 17th term = 3 + 48
=> 17th term = 51