If population of 10 countries are in G.P with common ratio 2 and average ages are in A.P. with common difference -10 years with first term 100 years respectively, then average age of all the persons is

If population of 10 countries are in G.P with common ratio 2 and avera

1.	If population of 10 countries are in G.P with common ratio 2 and average ages are in A.P. with common difference -10 years with first term 100 years respectively, then average age of all the persons is
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If population of 10 countries are in G.P with common ratio 2 and average ages are in A.P. with common difference -10 years with first term 100 years respectively, then average age of all the persons is​

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If population of 10 countries are in G.P with common ratio 2 and average ages are in A.P. with common difference -10 years with first term 100 years respectively, then average age of all the persons is