Question

find the 7th and 10th term of an AP whose nth term is 2n.​

Answer 1

Answer:

${7}^{th \:} term = 14 \\ {10}^{th} \: term = 20$

Step-by-step explanation:

Given-

$a _{n} = 2n$

To Find-

$a_{7 } \: and \: a_{10}$

SOLUTION-

$a _{n} = 2n \\ when \: n = 1 \\ a = 2 \times 1 = 2 \\ similarly \\ a _{2} = 2 \times 2 = 4 \\ hence \: d = 4 - 2 = 2$

$a _{7} = 2 + (7 - 1)2 \\ \: \: \: \: \: = 2 + 6 \times 2 = 2 + 12 = 14$

$a _{10} = 2 + (10 - 1)2 \\ \: \: \: \: \ \: \: = 2 + 9 \times 2 = 2 + 18 = 20$

REQUEST:

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