21. Insert the two numbers between 1/4 and 1/3
so that the resulting
sequence is hp
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Answer:
The resulting sequence must be HP hence their resiprocal must be AP
let, 4,a,3 are in AP.
therefore, 2a=4+3=7
a=7÷2
hence, 4, 7÷2, 3 are in AP and
1/4,2/7,1/3 are in HP
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