Question

फाइंड द सम ऑफ फर्स्ट 50 नेचुरल नंबर​

Answer 1

Answer:

1275

Step-by-step explanation:

=> 1+2+........+50

=>{50(50+1)} /2

[ because 1+2+.....+n = {n ( n+1 ) } /2 ]

=>(50× 51) /2

=>2550 /2

=>1275 .

Thank you .

Answer 2

Answer:

1275

Step-by-step explanation:

Sn= na+[n(n-1)]/2×d

=50×1+[50(50-1)]/2×1

= 50 +[50×49]/2

=50+(25×49)

=50+1225

=1275.

This is solved by Arithmetic Progression(A.P.)

(Sum of n terms of an A.P.)

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