Shaalaa.com | Finding the nth Term of a Geometric Sequence
The first term and the common difference of an A.P. is 10 and 5 respectively. Complete the following activity to find the sum of first 30 terms of the A. P.
`S_n=n/2[ ____+(n-1)d ]`
`∴ s_30=30/2[20+(30-1)xx _____ ]`
A survey was conducted in Aadarsh Vidyalaya to know the inclication of students towards different subjects. The data obtained is presented by the adjacent pie diagram. If the total number of students was 500, answer the following questions.
(i) How many students show inclination towards mathematics ?
(ii) How many students are inclined towards social sciences ?
(iii) How many more students are inclined towards languages than
The 11th term and the 21st term of an A.P. are 16 and 29 respectively, then find the 41thterm of that A.P.
A man borrows Rs 8000 and agrees to repay with a total interest of Rs 1360 in 12 monthly instalments. Each instalment being less than the preceding one by Rs 40. Find the amount of the first and last instalment.
Sachin invested in a national saving certificate scheme. In the first year he invested Rs 5000 , in the second year Rs 7000, in the third year Rs 9000 and so on. Find the total amount that he invested in 12 years.