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11. Arithmetic Progression
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Q13 of 102 Page 429

If, find the value of n.

To find: the value of n.


We can write it as



3n2 + 7 × n - 370 = 0


Therefore n = 37/3, 10


Rejecting 37/3 we get n = 10


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11

The first and last terms of an AP are 1 and 11 respectively. If the sum of its terms is 36, find the number of terms.

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In an AP, the pth term is q and (p + q)th term is 0. Show that its qth term is p.

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Write the sum of first n even natural numbers.

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Questions · 102
11. Arithmetic Progression
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 1 2 3 4 5 6 7 8 9 10 11 12 1 2 3 4 5 6 7 8 1 2 3 4 5 6 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17
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