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111. Find the sum of first 24 terms of the sequence whose nth term is giver. by

straight u subscript straight n equals 3 plus 2 over 3 straight n.

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112. Find the sum of first 20 terms of an A.P. in which 3rd term is 7 and 7th term is two more than thrice of its 3rd term.

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113. Find the sum of the first 57 terms of the A .P., whose second and third term are 14 and 18 respectively.

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114. Find the first term and common difference of an A .P. if the sum of the first 6 terms and 9 terms are 183 and 369 respectively.

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115. Find the first term and common difference of an A .P. if the sum of the first 6 terms and 9 terms are 183 and 369 respectively.

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Solution not provided.
Ans. 99090

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117. How many terms of the A .P. 78, 71, 64,........are needed to give the sum 468 ? Also find the last term of this A .P.

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118. If the sum of first n terms of an A .P. is 3n² – 2n, find the A .P. and its 19th term.

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119. Determine the sum of first 10 terms of an A .P. if its third term is 8 and 11th term is 20.

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120. The nth term a_n of an A .P. is given by a_n = 5 – 2n Find the sum of first 25 terms of the A .P.

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