Question

If a,b,c,d are in HP then ab plus bc plus cd is equals to
A)3ad. B)(a plus b) (c plus d) d)3ac
Choose correct option

Answer 1

usually, in these type of ques, to save time, i put in examples and solve them,
take for example, the numbers, 1/1,1/2,1/3,1/4
the answer will come the first option,