Question

9. If the sum of first 7 terms of an AP is 19 and that of 17 terms is 289, find the sum o
first n terms.
70. Show that a, a,,...... form an AP where u is defined as below:
basith
། །
Also find the sum of the insuranceli
11. If the sum of the first n terms of an AP is 4n-n", what is the first term (that is S,)? Wh
is the sum of first two terms? What is the second term? Similarly, find the 3rd, the 10th a
the nth terms.
12. Find the sum of the first 40 positive integers divisible by 6.
13. Find the sum of the first 15 multiples of 8.
14. Find the sum of the odd numbers between 0 and 59.
15/A contract on construction job specifies a penalty for delay of completion beyon
certain date as follows: 2200 for the first day, 250 for the second day, 300 for the ti
day, etc. the penalty for each succeeding day being 50 more than for the preceding
How much money the contractor has to pay as penalty. if he has delayed the work by
days?
16 A sum of 700 is to be used to give seven cash prizes to students of a school for
overall academic performance. If each prize is 20 less than its preceding prize, find​

Answer 1

Answer:

sry idk the answer

sry sry sry