20 of them.
The odd prime numbers from 1 to 50 are 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, and 47.
Thirteen.
odd multiples of 7 are odd numbers.. like 7*1, 7*3,7*5..
Infinity
20 of them.
26
There are 48/2 + 1 = 25 odd numbers in 1 to 49, inclusive.
1 +3 +5 = 9 7 + 13 + 23 = 43 111 +245 +789 = 1145 1145+43+9 = 1197 So the result will also be an odd number (while the sum of 2 odd numbers will always be even).
The odd prime numbers from 1 to 50 are 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, and 47.
Thirteen.
21 13 43 31 41 23 that's all so 6
odd multiples of 7 are odd numbers.. like 7*1, 7*3,7*5..
201
Infinity
71
250 of them.