Question

1+2+3+4+5+6+7+8+9..........+100
=?❓

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Answer 1

Answer:

n(n+1)/2

100×101/2

:5050

Step-by-step explanation:

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Answer 2

Answer:

a=1 d=1

formula used,

Sn=a+(n-1)d

Sn=1+(n-1)1

Sn=1+n-1

Sn=1

Step-by-step explanation:

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