Question

How many 2digit number are divided by 3

Answer 1

Answer:

the 2 digit number are

10,11,12,13,14................99

divided by 2 are

10,12,14,16,..........98

a=10,d=12-10=>2,an=98

an=a+(n-1)d

98=10+(n-1)2

98-10=(n-1)2

88=(n-1)2

88/2=n-1

44= n-1

n=44+1

n=45