Question

find the value of 2+4+6+...100th even number​

Answer 1

Answer:

200

Step-by-step explanation:

a = 2

d = 2

so 100 even term is

an = a + ( n-1 ) d

= 2 + 99 × 2

= 198 +2

= 200

Hence 100th term is 200

Answer 2

Answer:

2550

Step-by-step explanation:

a=2 d=2 an=100

an=a+(n-1)d

100=2+(n-1)2

98=2n-2

n=50

sn=n/2(2a+(n-1)d)

sn=25(4+(49)2)

sn=25(102)

sn=2550