1a,b,c,d ????????
Given that a,b are odd and c,d are even,then
A. a2 - b2 + c2 - d2 is always divisible by 4
B. abc + bcd + cda + dab is always divisble by 4
C. a4 + b4 + c3 + d3 + c2b +a2b is always odd
D. a +2b +3c +4d is odd
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2 Answers
62Sourangshu, the hint for this one is that
Odds are of the form 2n+1 and their prefect squares of the form 4k+1
evens of the form 2n, their perfect squares of the form 4k
Now try...