Answers

2015-01-07T21:47:31+05:30
1+2+3+4+5+6+7+.....................+100

Here first term , a = 1
Common difference, d = a
₂ - a₁
                                 = 2 - 1
                                 =1
Number of terms = 100

Sn = n/2 [ 2a + (n-1)d]
Sn = 50[2 + 99]
Sn = 50 × 101
Sn = 5050
0
sorry dont deletemy answer
ok thanks
4861
2015-01-08T14:31:07+05:30

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If the difference between each term is by 1 
and the series start from 1 
then you can use this formula        \frac{n(n+1)}{2 }         where n is number of terms

so using the formula we get      \frac{100*101}{2}
                                               

=  50 x 101 = 5050 ANSWER

0
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