(A*B) = 27. HCF(A,B) = 3. Their LCM is ___.
6
8
9
4
23of38of24 is
If the (r+1)th term in the expansion of (3√a√b+√b3√a)21 has the same power of a and b, then value of r is
If 13 and -13 are the roots of equation ax2+bx+c=0, then value of (a+b+c) is