Question

write down the first seven numbers that can be arranged as triangles ​

Answer 1

Answer:

Step-by-step explanation:

following are the first seven numbers that can be arranged as a triangle -

0,1,3,6,10,15,21

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Answer 2

Answer:

first 7 numbers which can be arranged as triangles are 3, 6,10,15, 21, 28, 36, Study the pattern: 1 × 8 + 1 = 9

Step-by-step explanation: