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?

Question

ng29 · Answer

=i think its quite easy , u can use the formula of sum of terms of gp commom terms is known and sum of 15 terms are also given put data in formula and get value of common ratio APPROVE IF USEFUL

sudhir · Answer

Hi ng29, if we use the sum of n terms formula we get 29=6(r^15-1)/r-1 => 6r^15 -29r – 23=0 now , how to get the value of r from here? plz. guide Thank you

ng29 · Answer

ok i understand that whats ur doubt equation of such higher degree is impossible to solve so method for this is hit and trial on putting r = -1 , condition is satisfied , hence the answer APPROVE IF USEFUL APPROVE IF USEFUL

sudhir · Answer

Hi, Thanks for your help...Is ther

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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?

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?

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