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What is the last digit in the product of the first 20 odd natural numbers?
The last digit in the product of the first 20 odd natural numbers can be determined by looking at the pattern of the units digit in the multiplication of consecutive odd numbers. The units digit of the product of consecutive odd numbers alternates between 1 and 5. Since there are 10 odd numbers between 1 and 19, and 20 is also an odd number, the last digit in the product of the first 20 odd natural numbers is 5.
How many different 2 digit odd numbers can be formed from the digits 1 through 8 if no digits are repeated in a number?
36
Imagine the numbers 1 through 30 written in a row If you added together any two numbers that are next to each other you'd always get an odd number?
Yes. Basic rule is two odds make an even, two evens make an even, an even and an odd make an odd. And note that any two consecutive numbers include exactly one odd and one even. Or more directly, if you start at number n you will add it to n+1 giving 2n+1. Since 2n is even, 2n+1 is odd.
Is 5.5 even or odd?
55 is an odd number. Odd numbers end in 1, 3, 5, 7, or 9. Even numbers end in 0, 2, 4, 6, or 8.
What is the sum of all the odd numbers from 1 to 100?
over 50
