If geometric mean and harmonic mean of two numbers a and b are 16 and 64/5 respectively, then the value of a : b is
4 : 1
3 : 2
2 : 3
1 : 4
If the sum offour numbers in GP is 60 and the arithmetic mean of the first and last numbers is 18, then the numbers are
3, 9, 27, 81
4, 8, 16, 32
2, 6, 18, 54
None of these
iF a,b and c are in HP, then for any n N, which one of the following is true ?
an + cn < 2bn
an + cn > 2bn
an + cn = 2bn
None of the above
B.
an + cn > 2bn
If a, b, c are in arithmetic progression, then will be in
arithmetic proression
geometric progression
harmonic progresssion
None of the above
If a > 1, b > 1 and c > 1 are in geometric progression, then will be in
arithmetic proression
geometric progression
harmonic progresssion
None of the above