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141. If the nth term of an A .P. is (2n + 1), find the sum of first n terms of the A .P.

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142. Find the sum of all two digit odd positive numbers.

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143. Find the sum of all multiples of 9 lying between 300 and 700.

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144. Find the sum of all multiples of 7 lying between 500 and 800.

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145. Which term of the A .P. 5, 9, 13,..........is 81 ? Also find the sum 5 + 9 + 13 +.........+ 81.

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146. Which term of the A .P. 5, 9, 13,..........is 81 ? Also find the sum 5 + 9 + 13 +.........+ 81.

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147. The sum of first n terms of an A .P. is given by (n² + 5n), find the 25th term of the progression.

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148. Which term of the A .P. 6, 10, 14..........is 102 ? Also find the sum 6 + 10 + 14 +........... 102.

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149. Find the sum of the first 51 terms of the A .P. whose 2nd term is 2 and nth term is 8.

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150. The sum of the first n terms of an A .P. is given by S_n = 3n² – n. Determine the A .P. and its 25th term.

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