How many natural numbers lie between 25 ^2 and 26 ^2?

How many natural numbers lie between 25² and 26²?
(a) 49
(b) 50
(c) 51
(d) 52

Solution:

Square of an even number is always
(a) even
(b) odd
(c) even or odd
(d) none of these

Solution:

1+ 3 + 5 + 7 + ……….. up to n terms is equal to
(a) n² – 1
(b) (n + 1)²
(c) n² + 1
(d) n²

Solution:

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