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if the first term of a gp is 6 ans the sum of first 15 terms is 29. find the common ratio of the gp?
=i think its quite easy , u can use the formula of sum of terms of gpcommom terms is known and sum of 15 terms are also givenput data in formula and get value of common ratio APPROVE IF USEFUL
Hi ng29,if we use the sum of n terms formula we get 29=6(r^15-1)/r-1=> 6r^15 -29r – 23=0now , how to get the value of r from here?plz. guide Thank you
ok i understand that whats ur doubtequation of such higher degree is impossible to solveso method for this is hit and trialon putting r = -1 , condition is satisfied , hence the answer APPROVE IF USEFULAPPROVE IF USEFUL
Hi, Thanks for your help...Is ther
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