JEE Mains · Maths · STD 11 - 7. binomial theoram
The total number of two digit numbers \('n',\) such that \(3^{n}+7^{n}\) is a multiple of \(10 ,\) is ..... .
- A \(45\)
- B \(54\)
- C \(36\)
- D \(63\)
Answer & Solution
Correct Answer
(A) \(45\)
Step-by-step Solution
Detailed explanation
for \(3^{ n }+7^{ n }\) to be divisible by \(10\) \(n\) can be any odd number \(\therefore\) Number of odd two digit numbers \(=45\)
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