121.Find the number of terms of the A .P. 54, 51, 48,........so that their sum is 513.
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122.Find the number of terms of A .P. 64, 60, 56........so that their sum is 544.
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123.The sum of first 13 terms of an A .P. is 21 and the sum of first 21 terms is 13. Determine the first 34 terms.
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124.If the sum of n terms of an A .P. is given by Sn = 3n2 + 2n Find the nth term of the A .P.
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125.The sum of n terms of an A .P. whose first term is 5 and common difference 36 is equal to the sum of 2n terms of another A .P. whose first term is 36 and common difference is 5, find n.
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126.The 7th term of an A .P is 32 and its 13th term is 62. Find the A .P.
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127.Find the sum of the first 25 terms of an A .P. whose 4th term is given by tn= 2 – 3n.
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128.The 7th terms of an A .P. is 20 and its 13th term is 32. Find the A .P.
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129.The 7th term of an A .P. is –4 and its 13th term is –16. Find the A .P.
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130.The 8th terms of an Arithmetic Progression (A .P.) is 37 and its 12th term is 57. Find the A .P.
Short Answer Type
