Question

by observing the above pattern
50+51+52....+100​

Answer 1

Step-by-step explanation:

Sn = (1 + 2 + 3 + ... + 50 + 51 + 52 + ... + 100) - (1 + 2 + 3 + ... + 50)

= 100 x (1 + 100)/2 - 50 x (1 + 50)/2

= (50 x 101) - (25 x 51)

= (5050 - 1275)

= 3775

Answer 2

Answer:

253

Step-by-step explanation:

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