If the coefficients of 2nd , 3rd and 4th terms in the expansion of (1+x)n are in A.P. then find the value of n. Hence find the middle terms

Dear Student,
Please find below the solution to the asked query:

n2-2n-7n+14=0nn-2-7n-2=0n-2n-7=0n2n=7Middle terms will be 7+12=4th and 7+32=5th terms in 1+x7T4=T3+1=7C3 x3T5=T4+1=7C4 x4

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