1 + 2 + ... + 250 = 31375
1 + 2 + ... + 250 = 1/2 (1 + 2 + ... + 250 + 250 + 249 + ... + 1)
= 1/2 ((1 + 250) + (2 + 249) + ... + (250 + 1))
= 1/2 (251 + 251 + ... + 251)
= 1/2 x 250 x 251
= 31375
2 odd numbers added together equal an event number. to even numbers added together equal an even number. it is impossible to make 4 odd numbers equal an even.
32 + 32
Two (or four) digits added together cannot equal 42. Two-digit numbers multiplied together cannot equal 82.
93 + 93
139, 11 and 2
The numbers 1 through 750 added together equal an infinitely large number, since there are infinitely many numbers between any two numbers..However, the integers 1 to 750 added together = 751*750/2 = 281625
two prime numbers when added together will equal 63: 2 + 61
2 odd numbers added together equal an event number. to even numbers added together equal an even number. it is impossible to make 4 odd numbers equal an even.
26
The numbers are -10 and -70
The numbers are 55.5 and 44.5
3595 and 1, when added together, and 3575 and 20 when added together
15
32 + 32
Two (or four) digits added together cannot equal 42. Two-digit numbers multiplied together cannot equal 82.
18
Urny ony