nd the sum of first 100 odd natural numbers.
13. In an AP. a= 2 and sum of the first five terms is one-fourth the sum of th
terms Show that its 20th term is -12.
(Hint: If AP is a, a + d. a + 2d, .... then S.
(a + (a + 4d)]
In the next five terms, the first term is a +5d and last term is a +9d.
14. If sum of first n terms of an AP is 2n + 3n, find rth term of the A.P. (Hint
15. Find the sum of all 3-digit numbers which leave the remainder 1, when d
(Hint: First term=101. last term = 9971
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