Question

Complete the series - 1,3,10,24,64,129,?,777

Answer 1

Complete the series - 1,3,10,24,64,129,388,777

Answer 2

$Given \: series : 1,3,10,24,64,129,\red{?}, 777$

/* Observe the series, we can find the following pattern */

$First \:term = 1$

$Second \:term \blue {= 1\times 2 + 1 = 3 }$

$Third \: term \pink {= 3 \times 3 + 1 = 10}$

$Fourth \: term \blue {= 10 \times 2+ 1 = 21 }$

$Fifth\: term \pink {= 21 \times 3 + 1 = 64 }$

$Sixth \: term \blue {= 64\times 2 + 1 = 129 }$

$\red{ Seventh \: term} \pink {= 129 \times 3 + 1 = 388}$

$Eighth \: term \blue {= 388 \times 2 + 1 = 777}$

Therefore.,

$\red { Missing \:term }\green {= 388}$

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