Question

A. The cardinal number of {213, 214, 215, 216, ..., 912) is

Answer 1

Explanation:

a=213

l=912

let cardinal number=n

let c.d.=d

d=214-213=1

l=a+(n-1)d

912=213+(n-1)1

912=213+n-1

912-212=n

n=700

cardinal number=700