Answers

  • Brainly User
2015-01-07T22:26:36+05:30
Using formula   \frac{n(n+1)}{2}]

250 x 251 / 2 = 125  x 251 = 31375
1 5 1
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2015-01-08T07:50:49+05:30
1+2+3+4+5+6+7+.....................+250

Here first term , a = 1
Common difference, d = a
₂ - a₁
                                 = 2 - 1
                                 =1
Last term or an = 250
Number of terms = 250

Sn = n/2 [ 2a + (n-1)d]
Sn = 125[2 + 244]
Sn = 125 × 251
Sn = 31375
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