AMU Engineering 2018 solved paper Solved Paper

Section: Mathematics

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Question : 138 of 150

Marks: +1, -0

Which of the following is an incorrect statement?

n3+3n2+5n+3 is divisible by 3 for all n∈IN
n(n+1)(2n+1) is divisible by 6 for all n∈IN
n2−n+41 is a prime number for all n∈IN
7n−3n is divisible by 4 for all n∈IN where IN denotes the set of all natural numbers.

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