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Which rule gives the sum of three numbers in a row (like 5, 6, 7) that start at n?

Class 6Rules and Formulas with VariablesAlgebra

An + 3
B $3 n + 3$
C $3 n + 2$
D $3 n$

Step-by-Step Solution

The numbers are

n, n + 1

and

n + 2

. Sum =

3 n + 3

. Check with

n = 5

: 5 + 6 + 7 = 18 and

3 \times 5 + 3 = 18

.

Answer: B)

3 n + 3

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