The sum of the first n odd numbers is n squared! So, the short answer is that the sum of the first 70 odd numbers is 70 squared, i.e. 4900.
Allow me to prove the result: odd numbers come in the form 2n-1, because 2n is always even, and the number immediately before an even number is always odd.
So, if we sum the first N odd numbers, we have
The first sum is the sum of all integers from 1 to N, which is N(N+1)/2. We want twice this sum, so we have
The second sum is simply the sum of N ones:
So, the final result is
which ends the proof.
Solutions
1hr = 60 min
180 ÷ 60 = 3
<span>180 min = 3 hrs </span>
Answer:
Hii i just know the 4 and 5 one
Step-by-step explanation:
4 one is exterior
5 one is included angle
Answer:
Step-by-step explanation:
Given
Required
Determine the probability of 6 different lower case letters <em>(Question continuation)</em>
<em />
There are 26 lower case letters.
The first can be any of letters 26
The second can be any of letters 26 - 1
The third can be any of letters 26 - 2
The fourth can be any of letters 26 - 3
The fifth can be any of letters 26 - 4
The sixth can be any of letters 26 - 5
Number of selection is:
The probability is:
<em></em><em> --- approximated</em>
Answer:
-14.8p+25.9
Step-by-step explanation:
got it right edge 2020.
