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151. The sum of the first n terms of an A .P. is given by S_n = 3n² – 4n. Determine the A .P. and its 12th terms.

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Solution not provided.
Ans. -5, 1, 7 or 7, 1, -5

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153.

Find the sum of the first 21 terms of the A .P. whose 2nd terms is 8 and 4th term is 14.

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154.

The sum of the first n terms of an A .P. is given by S_n = 3n² + 2n. Determine the A .P. and its 15th term.

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155.

The sum of the first n terms of an A .P. is given by S_n = 3n² + 2n. Determine the A .P. and its 15th term.

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156. Find the sum of the first 25 terms of the A .P. whose 2nd term is 9 and 4th term is 21.

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157. The 6th term of an Arithmetic Progression (A .P.) is –10 and the 10th terms is -26. Determine the 15th term of the A .P.

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158. Find the sum of all the two digit natural numbers which are divisible by 4.

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159. Find the sum of all natural numbers between 100 and 200 which are divisible by 4.

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160. Find the sum of all the natural numbers less than 200 which are divisible by 5.

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