49
51
57
61
81
2006-08-05 23:22:41 · 8 answers · asked by busycatman 1 in Education & Reference ➔ Homework Help
49 is divisible by 7
51 is divisible by 3
57 is divisible by 3
81 is divisible by 9
SO 61 is PRIME
2006-08-06 00:29:10 · answer #1 · answered by MollyMAM 6 · 0⤊ 0⤋
Hi, Only 61 is a prime number.
the rest can be divided by other numbers cept for 49 which is 7^7, and 61 which is a prime number. You can try dividing the rest of the numbers by 3 and you will get perfect solutions.
Hope this helps. :D
2006-08-05 23:49:12 · answer #2 · answered by boingo 3 · 0⤊ 0⤋
51,57,61.
Try dividing each by 2, 3, 5, or 7. If it doesn't work, then it's a prime.
49 is divisible by 7
81 is divisible by 3
2006-08-05 23:27:17 · answer #3 · answered by polloloco.rb67 4 · 0⤊ 0⤋
only 61 is a prime number since
49=7*7
51=3*17
57=3*19
81=3*27 or 9*9
2006-08-06 00:55:32 · answer #4 · answered by somesh n 1 · 0⤊ 0⤋
61 IS THE PRIME NUMBER.A NUMBER WHICH HAS ONLY ONE AND ITSELF
IS A PRIME NUMBER.7*7 =49,17*3=51,19*3=57,9*9=81 SO THESE NUMBERS CANNOT BE PRIMENUMBERS
2006-08-05 23:49:46 · answer #5 · answered by PADMA 1 · 0⤊ 0⤋
51, 61
49 = 7x7
57 =3x19
81= 9x9
2006-08-05 23:33:52 · answer #6 · answered by LORD Z 7 · 0⤊ 0⤋
51
57
61
2006-08-05 23:31:22 · answer #7 · answered by A.S4Y3D 2 · 0⤊ 0⤋
51
57
61
2006-08-05 23:26:29 · answer #8 · answered by time-OUT 4 · 0⤊ 0⤋