21
No.
Yes, as -2 divided by 2 results in a natural number.
Look at the series of even natural numbers: 2, 4, 6, 8, 10, 12 ... Now the positions of these numbers are: 1, 2, 3, 4, 5, 6.. If you match the position with corresponding natural number (eg. 1 with 2, 2 with 4 and so on) it looks like the corresponding Natural number is twice as the position number. The answer is: 69 x 2 = 138
8
natural numbers are used in real life for counting, adding, subtracting and even for calculting money purposes
In normal arithmetic, never.
Find the sum of the first hundred even natural number divisible by 5?
A set is a set and does not need an arithmetic operation.
It can, for example, in base 7 arithmetic.
YES. Any even natural number is a multiple of 2.
It can be any number. Two numbers do not even determine whether the "sequence" is arithmetic, geometric or other.
You take the arithmetic mean of the middle two numbers.
No.
114 The equation is 50x + summation (2(n-1) = 3250 where n = 1 to 50 and x is first even number
even, whole, non-negative numbers. (zero is not a natural number)
Yes, that is correct.
2