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Here first term , a = 1

Common difference, d = a₂ - a₁

= 2 - 1

=1

Number of terms = 100

Sn = n/2 [ 2a + (n-1)d]

Sn = 50[2 + 99]

Sn = 50 × 101

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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 where n is number of terms

so using the formula we get

= 50 x 101 = 5050__ANSWER__

and the series start from 1

then you can use this formula where n is number of terms

so using the formula we get

= 50 x 101 = 5050