alleryنقطے 1, 3, 6, 10, 15 نقطوں کے ساتھ مثلث بناتے ہیں۔ اگلے میں کتنے نقطے ہیں؟
A28
B21
C24
D20
Answer & Solution
Correct answer: B. 21
خلا ہر بار ایک بڑھتا ہے (2، 3، 4، 5)، لہذا اگلا فرق 6 اور 15 + 6 = 21 ہے۔
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