Answer:
correct option is C) 80
Step-by-step explanation:
given data
three-digit integer > 700
solution
As we know that 3 digit number can be here as 3 patterns
1. all 3 digit distinct
2. 2 a like and 3rd is different
3. all 3 digit are a like
so here
we get here (2.) 2 a like and 3rd is different
that is Total - (1) - (3)
here total 3 digit number greater than 700 as 700 to 999
total = 299
when all 3 digit distinct, 1st digit have only 3 values they are 7, 8, 9
so they will as
all 3 digit distinct = 3 × 9 × 8
all 3 digit distinct = 216
and
when all 3 alike they are
all 3 alike = 3
as they is 777, 888 and 999
so that two digits equal to each other and the remaining digit different is
= 299 - 216 - 3
=80
so correct option is C) 80
