If m times the mth term of an A.P. is equal to n times its nth t
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Arithmetic Progressions
Short Answer Type
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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134.
The 8th term of an Arithmetic Progression (A .P.) is 32 and its 12th term is 52. Find the A .P.
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135.
If the sum of first n terms of an A .P. given by S
n
= 3n
2
+ 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.
Solution not provided.
Ans. 0
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137.
If the sum of first n terms of an A .P. is given by S
n
= 2n
2
+ 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
= 5n
2
+ 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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15
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