If a1,a2,.....are in HP and

f(k)=sigma a_r( where r runs from 1 to n) - a_k

then a₁/f(1),a₂/f(2),......a_n/f(n) are in ......(AP ,GP OR HP)??

Dear student,

a1,a2,a3 are in HP

f(1)=ar-a1

f(2)=ar-a2

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--

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So on..

We see that a1/f1,a2/f2...... are in AP..

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