They are: 2+3+5+7 = 17
The sum of the first four prime numbers is 17.
The sum of the first four prime numbers is 17.
The sum is 17.
The sum of the first four non-negative, consecutive, even integers is 20.
twenty
16
Suppose the first term is a, the second is a+r and the nth is a+(n-1)r. Then the sum of the first five = 5a + 10r = 85 and the sum of the first six = 6a + 15r = 123 Solving these simultaneous equations, a = 3 and r = 7 So the first four terms are: 3, 10, 17 and 24
1+3+6+10 =20
It is: 8+16+24+32 = 80
The sum of four and negative eight is negative four.
Only one . . . ' 23 '.
As a product of its prime factors: 2*3*13 = 78