4. How many terms of the AP:9.17.25...must be taken to give a sum of 636?
5. The first term of an AP is 5. the last term is 45 and the sum is 400. Find the number of terms
and the common difference.
6. The fint and the last terms of un APare 17 and 350 respectively. If the common difference
is 9. bow many terms are there and what is their sum?
7. Find the sum of first 22 terms of an AP in which d= 7 and 22nd term is 149.
8. Find the sum of first 51 terms of an AP whose second and third terms are 14 and 18
respectively
9. If the sum of first 7 terms of an AP is 49 and that of 17 terms is 289, find the sum of
first in terms
10. Show that a, 4,...... form an AP where a, is defined as below:
© a = 3-4
(i) a = 9-5
Also find the sum of the first 15 terms in each case,
11. Ir the sum of the first in terms of an AP is 4n-'. what is the first term (that is S.)? What
is the sum of first two ters? What is the second term? Similarly, find the 3rd, the 10th and
the nth terms
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