Solve this most interesting question of Binomial associated with A.P.

Solve this most interesting question of Binomial associated with A.P.
If the coefficients of 2nd, 3rd, &4th terms in the expansion of (1+x) ^n are in A. P., Find 'n'
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link of binomial theorem part 1
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link of binomial theorem part 2
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link of part 3
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link of binomial theorem part 4
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