1.If the coefficients of x4,x5x^4, x^5x4,x5 and x6x^6x6 in the expansion of (1+x)n(1 + x)^n(1+x)n are in arithmetic progression, then the maximum value of nnn is:a.777b.212121c.282828d.141414Login to continueOnly logged in users canattempt or see the solution.
