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If an= the digit at units palce in the n...

If `a_n=` the digit at units palce in the number o`1!+2!+3!+……….n!` for `nge4` the `a_4, a_5, a_6, ………` are in (A) A.P. only (B) G.P. only (C) A.P. and G.P. only (D) A.P., G.P. and H.P.

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