Question

Ques If nth term of an AP is 2n +5, then find first 4 terms
of AP​

Answer 1

Answer:

$\red { First \: 4\:terms \: in \: given \:A.P\:are}$

$\green { 7,9,11\:and \: 13}$

Step-by-step explanation:

$Given \: \red{ n^{th}\:term \:of\:A.P(a_{n})=2n+5}\:---(1)$

/* Substitute n = 1,2,3,4 in equation (1), we get

$i) First\:term (a_{1})= 2\times 1 + 5 = 2+5=\pink {7}$

$ii)Second\:term (a_{2})= 2\times 2 + 5 = 4+5=\pink {9}$

$iii) Third\:term (a_{3})= 2\times 3 + 5 = 6+5=\pink {11}$

$iv) Fourth\:term (a_{4})= 2\times 4+ 5 = 8+5=\pink {13}$

Therefore.,

$\red { First \: 4\:terms \: in \: given \:A.P\:are}$

$\green { 7,9,11\:and \: 13}$

•••♪

Answer 2

Four terms becomes 7,9,11,13.

Step-by-step explanation:

Since we have given that

$a_n=2n+5$

For n = 1

$a_1=2(1)+5=2+5=7$

For n = 2,

$a_2=2(2)+5=4+5=9$

For n = 3,

$a_3=2(3)+5=6+5=11$

For n = 4,

$a_4=2(4)+5=8+5=13$

So, four terms becomes

7,9,11,13.

# learn more:

2n+5 is the nth term of an ap find the first term.

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