No.
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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
The first 3 digit natural number is 100: 100 ÷ 4 = 25 → first 3 digit natural number divisible by 4 is 4 × 25 The last 3 digit natural number is 999: 999 ÷ 4 = 249 r 3 → last 3 digit natural number divisible by 4 is 4 × 249 → number of 3 digit natural numbers divisible by 4 is 249 - 25 + 1 = 225.
Yes, as -2 divided by 2 results in a natural number.
21
No, because two odd numbers always add together to be an even number, and a even plus an odd number is an odd number, example: 3+1+11=An even number? 3+1=4 4+11=15 Is 15 even? No. 3+1+11= An odd number (15)