Question

determine a soma dos numeros pares positivos menores doqie 101

Answer 1

An=a1+(n-1).r
100=2+(n-1).2
100=2+2n-2
100-2=2n-2
98=2n-2
98+2=2n
100=2n
100/2=n
n=50
Sn=(a1+an).n/2
S50=(2+100).50/2
S50=102.50/2
S50=102.25
S50=2550