allery13, 17, 19 ଏବଂ 21 ମଧ୍ୟରୁ କାହାର 1 ଏବଂ ନିଜ ବ୍ୟତୀତ ଅନ୍ୟ ଏକ ଗୁଣନୀୟକ ଅଛି?
A17
B13
C21
D19
Answer & Solution
Correct answer: C. 21
21 = 3 x 7, ତେଣୁ ଏହା ଦୁଇଟି କ୍ଷୁଦ୍ର ଗଣନ ସଂଖ୍ୟାର ଗୁଣଫଳ ଅଟେ, ଯେତେବେଳେ କି ଅନ୍ୟମାନଙ୍କର ଏପରି କୌଣସି ବିଭାଜନ ନାହିଁ।
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