If x and (x+11)/2 are integers, which of the following must be true? i. x is odd ii. x is a multiple of 9 iii. (x +9)/2 is an integer
A
i only
B
ii only
C
iii ony
D
i and ii
Correct Answer: i only
x odd হলেই x + 11 even হবে। তাই 2 দিয়ে ভাগ যাবে। Similarly, x + 9, 2 দ্বারা বিভাজ্য। but x, 9 এর. multiple হতে পারে but must নয়।