Answer:
The sum is even :p
Step-by-step explanation:
=3240
3240 is even so the parity of the sum of 80 consecutive natural numbers is even!
7.
21 = 3 * 7
28 = 2 * 2 * 7
42 = 2 * 3 * 7
Collecting common factors:
t is common to all 3 sets of factors so
HCF = 7.
