Question

1+2+3+4.........+50​

Answer 1

Answer:

this is an arithmetic progression question..

a=1

d=1

n=50

Sn=50/2 (2 + (50-1))

=25 X 51

= 1275

Step-by-step explanation:

hope it helps

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Answer 2

Summation =n(a+l)/2 where n= no. of terms; a= first term; l=last term

Here n=50 ; a=1 ; l=50

therefore, n(a+l)/2=50(1+50)/2=50×51/2

,................=25×51=1275