The 288th term of the series a, b, b, c, c, c, d, d, d, d, e, e, e, e, e, f, f, f, f, f, f, . . . is:
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By summation formula 1+2+3+4+....n= We get 227th term will be X and 300th term will be Y. so 288th term is X
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