Consider the following sequence of successive numbers of the 2k -th power: 1, 2^2k, 3^2k, 4 ^2k, 5 ^2k, ... Show that the difference between the numbers in this sequence is odd for all k ∈ N.
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Given : 2^2k, 3^2k, 4^2k, 5^2k, ...
To Find : Show that the difference between the numbers in this sequence is odd for all k ∈ N.
Solution:
2^2k, 3^2k, 4^2k, 5^2k, ...
Any even number raised to power any +ve integer is always even
Any odd number raised to power any +ve integer is always odd
Hence two consecutive numbers on sequence are
EVEN & ODD
Difference between two odd number = EVEN
Difference between two even number = EVEN
Difference between ODD & EVEN number = ODD
Hence the difference between the numbers in this sequence is odd for all k ∈ N.
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