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Posted by on Monday, May 9, 2011 at 7:13am.

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 - , Monday, May 9, 2011 at 7:54am

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

    or, use the formula

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

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