The ratio of 11 term of an ap to its 18 term is 2:3 find the ratio of sum of first 5 terms to sum of first 10 terms
Answers
Answered by
1
first use tn formula and find t11 and t18
then keep it in ratio and cross multiply it and then u will get a=4d
Use Sn formula for S5 and S10 substitute a=4d then u will get S5 = 30d, S10 =95d
keep it in ratio cut 'd' and divide it
Final ans is 6:17
then keep it in ratio and cross multiply it and then u will get a=4d
Use Sn formula for S5 and S10 substitute a=4d then u will get S5 = 30d, S10 =95d
keep it in ratio cut 'd' and divide it
Final ans is 6:17
jainvineet1111:
Give full solution
Similar questions