A.2,3,5,9
B.3,11,23,31
C.2,5,15,19
D7,17,29,49
2006-06-13 05:22:10 · 24 answers · asked by Anonymous in Science & Mathematics ➔ Mathematics
B
2006-06-13 05:25:08 · answer #1 · answered by Anonymous · 1⤊ 0⤋
B
all primenumbers are of form 4n+1 or 4n-1 (except 2 of course!)
to check a larger number whether its prime, check whether it is divisible by any primenumber lower than its square rootroundedof to nearest integer.
Of course you don't need to do this here.
MODIFY- all numbersof the form given above are not prime. Prime numbers aredivisible only by themselvs or by unity (1)
2006-06-13 12:36:43 · answer #2 · answered by shrek 5 · 0⤊ 0⤋
B is the correct answer. Numbers 9 (A), 15 (C), and 49 (D) are NOT prime.
2006-06-13 12:26:30 · answer #3 · answered by DrHoenikker 1 · 0⤊ 0⤋
prime number is one which is not divided by any other no. It can be divided by 1 and the number itself. Hence answer is b.
2006-06-13 12:27:37 · answer #4 · answered by Vivek 4 · 0⤊ 0⤋
All are Prime numbers.
please post this at the joke section if you are trying to be funny.
2006-06-13 13:15:09 · answer #5 · answered by redhead2734 3 · 0⤊ 0⤋
B cuz its a magic number
2006-06-13 12:26:51 · answer #6 · answered by Scott M 1 · 0⤊ 0⤋
B
You seriously need to study
2006-06-13 12:26:20 · answer #7 · answered by ag_iitkgp 7 · 0⤊ 0⤋
B only.
2006-06-13 12:25:27 · answer #8 · answered by Jeremy M 3 · 0⤊ 0⤋
b
2006-06-13 16:34:11 · answer #9 · answered by reneelf2002 3 · 0⤊ 0⤋
b
2006-06-13 14:35:00 · answer #10 · answered by charmed4innocent 2 · 0⤊ 0⤋
b
2006-06-13 12:26:23 · answer #11 · answered by Anonymous · 0⤊ 0⤋