(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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#  Quiz 

1
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How many terms are there in 20, 25, 30 . . . . . . 140?
Solution 
2
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The sum of the first 16 terms of an AP whose first term and third term are 5 and 15 respectively is
Solution 
3
Discuss

The nth term of an A.P., the sum of whose n terms is Sn, is
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4
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The 3rd and 9th term of an arithmetic progression are 8 and 10 respectively. What is the 16th term?
Solution 
5
Discuss

What is the sum of all positive integers up to 1000, which are divisible by 5 and are not divisible by 2?
Solution 
6
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The 2^{nd} and 8^{th} term of an arithmetic progression are 17 and 1 respectively. What is the 14^{th} term?
Solution 
7
Discuss

Which term of the A.P. 24, 21, 18, ............ is the first negative term?
Solution 
8
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Let S denotes the sum of n terms of an A.P. whose first term is a. If the common difference d is given by d = S_{n} – k S_{n1} + S_{n2} then k =
Solution 
9
Discuss

The 2nd and 8th term of an arithmetic progression are 17 and 1 respectively. What is the 14th term?
Solution 
10
Discuss

The sum of first five multiples of 3 is:
Solution 
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