Which of these is a prime number 1,11,21,51 ?
2 answers:
11,,21,51 are all prime numbers
A prime number has exactly 2 different factors, 1 and itself.
11 is divisible only by 1 and 11.
11 is prime.
21 and 51 have a least three factors. They are not prime.
1 has only 1 factor. 1 is not prime.
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6* 25 = 150 = (6*20= 120) + (6*5=30) Then Add 120+30= 150 so your answer is 5
