Question

Do no. 13 plzz ...Its of AP of class 12 maybe...

Answer 1

HERE IS YOURS SOLUTION;

◆ If a,b,c are in ap, then; their common difference would be:

b – a and c-b

and therfore;

2b = a+c..................(1)

If;

1/ba, 1/ca, 1/cb are in A.P,

then;

2/ca = 1/ba + 1/cb

Now, by taking L.C.M abc and calculating we get;

again,

2b = a + c.................(2)

hence eqn. (1) and (2) comes out to be same.

Therefore this series is also in A.P.

HENCE PROVED


HOPE IT HELPS

Answer 2

Answer:

Answer

HERE IS YOURS SOLUTION;

◆ If a,b,c are in ap, then; their common difference would be:

b – a and c-b

and therfore;

2b = a+c..................(1)

If;

1/ba, 1/ca, 1/cb are in A.P,

then;

2/ca = 1/ba + 1/cb

Now, by taking L.C.M abc and calculating we get;

again,

2b = a + c.................(2)

hence eqn. (1) and (2) comes out to be same.

Therefore this series is also in A.P.

HENCE PROVED

HOPE IT HELPS