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How many terms of the series 1+ 2+2+--must be taken to make 5112 |
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Answer» solution:1+2+2^ +.....common ratio=2/1=2^/2=2first term a=1sum of n terms = a*1-r raised to n /1-rso,511=1*1-2 raised to n /1- 2511= 2 n^ -1512=2n ^256=n ^16= nhence 16 terms of series must be taken to make 511. |
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