Find the consecutive terms in the binomial expansion oif `(3+2x)^7` whose coefficients are equal

The two consecutive terms in the expansion of (3+2x)^(74) whose coefficients are equal are

For beta ne 0 , if the coefficient of x^(3) in the binomial expansion of (1 + betax)^(6) and the coefficient of x^(4) in the binomial expansion of (1 - betax)^(8) are equal, then the value of beta is

If the ratio of coefficients of the three consecutives terms in binomial expansion of (1+x)^(n) is 2:5:70. Then the average of these coeficients is