document.write( "Question 1089211: If the coefficient of 2nd,3rd and 4th terms in the expansion of (1+x)^n are in A.P, then what is the value of n?
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Algebra.Com's Answer #703570 by ikleyn(52915) $\"\"$ $\"About$

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document.write( "HINT.  If the numbers a, b and c form an AP, then  b = .\r\n" );
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