# math

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Chris received \$1 on his first birthday,\$3 on his second birthday,\$6 on his third birthday,\$10 on his four birthday.How much money will Chris receive on his eighth birthday if the pattern continues?

• math -

1+2+3+4+5+6+7+8 = 36

or, use the formula

n(n+1)/2 = \$ 36 (n = 8)

• math -

1+2+3+4+5+6+7+8 =36

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