Statement 1: the sum of first 30 terms of the sequence `1,2,4,7,11,16,22....` is `4520.` Statement 2: If the successive differences of the terms of a sequence form an A.P. then general term of sequence is of the form `an^2+bn+c.` (i) Statement I is correct , Statement II is correct , Statement II is correct explanation of Statement I (ii) Statement I is correct , Statement II is correct , Statement II is not correct explanation of Statement I (iii) Statement I is True , Statement II if False (iv) Statement I is False , Statement II if True