Question

2+3+4+.......100=...... What is the correct answer for this
A) 5050
B)5049
C)5115
D)1155
Choose the correct answer.

Answer 1

2+3+4......100=....

mate here

A=2

D=1

An=100

now by using formula we get

An=a+(n-1)d

100=2+n-1

n=100-2+1

n=99

now by using formula we get

sn=n/2(a+an)

sn=99/2(2+100)

sn=99/2*102

sn=99*51

sn=5049

so mate 5049 is right answer

hope it will helpful to you

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