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Can someone help me with this question please.
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Can someone help me with this question please.

Can someone help me with this question please.-example-1
User BassT
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2 Answers

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The answer would most defiantly be “21”, choice c “21”
User Gagan Gupta
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3 votes

Answer:

21

Explanation:

The formula for triangular numbers is n×(n+1)÷2 (n is the step of next number)

we have 1, 3, 6, 10, 15 so the next step would be 6th

6×(6+1)÷2 = 21

User Mina Samir
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