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16,23,9,30,2, () to find the law needs method
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The rule is + 7 - 14 + 21 - 28 + 35;
According to this rule: we can get the answer: 2 + 35 = 37;
1+3+5+7+9+···+(2n-5)+(2n-3)+(2n-1)+(2n+1)
Do it, just the answer
The square of (n + 1)
1 + 3 + 5 + 7 + 9 +. + 2N-1 = how much
1+3+5+7+9+.+(2n-1)
=[1+(2n-1)]+[3+(2n-3)]+[5+(2n-5)]+……
=2n+2n+2n+……
=2n[1+(2n-1)]/2
=2n²
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