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131. Find the sum of the first 25 terms of an A .P. whose nth term is given by t_n= 7 – 3n.

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132. Which term of the Arithmetic Progression 3, 10, 17........will be 84 more than its 13th term ?

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133. The 8th term of an Arithmetic Progression (A .P.) is –23 and its 12th term is 39. Find the A .P.

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Solution not provided.
Ans. -3, 2, 7, 12, ...

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135. If the sum of first n terms of an A .P. given by S_n = 3n²+ 2n. find the nth term of the A .P.

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136. If m times the mth term of an A.P. is equal to n times its nth term, find its (m + n)th term.

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137. If the sum of first n terms of an A .P. is given by S_n = 2n² + 5n, find the nth term of the A .P.

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138. Find the sum of first 15 terms of an A .P. whose nth term is 9 – 5n.

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139. If the sum of first n terms of an A .P. is given by S_n = 5n² + 3n, find the nth term at the A .P.

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140. Find the number of terms of the A .P. 54, 51, 48.......so that their sum is 513.

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