alleryટપકાંઓ 1, 3, 6, 10, 15 ટપકાં ધરાવતા ત્રિકોણ બનાવે છે. હવે પછીના ત્રિકોણમાં કેટલાં ટપકાં હશે?
A28
B21
C24
D20
Answer & Solution
Correct answer: B. 21
તફાવત દર વખતે એક વધે છે (2, 3, 4, 5), તેથી હવે પછીનો તફાવત 6 છે અને 15 + 6 = 21 થાય છે.
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