Environmentalists are suggesting the 4th R along with 3’R’s. Explain.

The resistance of A and B are R_A and R_B and R_A < R_B the electrical resistivities are S_A and S_B then the correct explanation is

An object completes 1/4th revolution of a circular path of radius r. Then find the ratio of distance and displacement.

If the coefficients of r^(th) , (r + 1)^(th) and (r + 2)^(th) terms in the binomial expansion of (1 + y)^m are in A.P. then m and r satisfy the equation

The equation of the plane passing through (3, 4,-2) and whose normal has the d.r.'s (2, 3, 4) is

If the coefficients of (2r+4)^("th") term and (3r+4)^("th") term in the expansion of (1+x)^(21) are equal, find r.

If the coefficients of (2r+1)th term and (4r+5)th term in the expansion of (1+x)^10 are equal then r=