Question

evaluate a20 and write what it represent in an=4n-1 sequence

Answer 1

$Given \: sequence \: a_{n} = 4n - 1$

/* Substitute n = 20 in above equation , we get */

$a_{20} = 4 \times 20 - 1$

$= 80 - 1$

$= 79$

Therefore.,

$\red{ The \: value \: of \: a_{20} } \green { = 79}$

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