Question
Question: Which of the following expression is divisible by 1225-...
Which of the following expression is divisible by 1225-
A
62n –35n –1
B
62n – 35n + 1
C
62n– 35n
D
62n – 35n + 1
Answer
62n –35n –1
Explanation
Solution
62n – 35n – 1 = (1+ 35)n –35n– 1
= (35)2 [nC2 + nC3. 35 +......]
Ž divisible by 1225
and hence other B, C, D are not divisible by 1225.