How many odd integers between 200 and 600 are there such that their tens digit is even?
A. 20
B. 25
C. 100
D. 150
E. 200
Answer -C
A. 20
B. 25
C. 100
D. 150
E. 200
Answer -C
Think it logically rather than mathematically.[email protected] wrote:How many odd integers between 200 and 600 are there such that their tens digit is even?
A. 20
B. 25
C. 100
D. 150
E. 200
Answer -C
There are 400 integers between 200 and 600. Out of which half will be even and half will be odd. So there are 200 odd integers. Now out of 200 odd integers half will have tens digit even and half will have tens digit odd. So out of 200 only 100 will have tens digit even.
Because we have 5 odd digits (1,3,,5,7,9) and 5 even digits(0,2,4,6,8).
So the correct answer is [/spoiler]C[spoiler][/spoiler]
