(1) + (1 + 1) + (1 + 1 + 1) + ....... + (1 + 1 + 1 + ...... n - 1 times) = ......
\(\frac{{n\left( {n + 1} \right)}}{2}\)
\(\frac{{n\left( {n - 1} \right)}}{2}\)
\({n^2}\)
n
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1
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The 3rd and 7th term of an arithmetic progression are -9 and 11 respectively. What is the 15th term?
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2
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The sum of first five multiples of 3 is:
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3
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If the first term of an A.P. is 2 and common difference is 4, then the sum of its 40 term is
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4
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If a + 1, 2a + 1, 4a - 1 are in A.P., then the value of a is:
Solution |
5
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The 4th and 7th term of an arithmetic progression are 11 and -4 respectively. What is the 15th term?
Solution |
6
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If the nth term of an A.P. is 2n + 1, then the sum of first n terms of the A.P. is
Solution |
7
Discuss
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What is the sum of the first 11 terms of an arithmetic progression if the 3rd term is -1 and the 8th term is 19?
Solution |
8
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If 7 times the seventh term of an Arithmetic Progression (AP) is equal to 11 times its eleventh term, then the 18th term of the AP will be
Solution |
9
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What is the sum of the first 13 terms of an arithmetic progression if the first term is -10 and last term is 26?
Solution |
10
Discuss
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The sum of first five multiples of 3 is:
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