Question

for a+15d=100, the value of n is ​

Answer 1

Answer:

a+15=100

an=a+(n-1)d ....... (i) , an=a+15d........ (ii) a+(n-1)d=a+15d n=15+1,,,,,. n=16 Ans__.

Answer 2

$We \: know \:that ,$

$If \: 'a' \: and \: 'd' \: are \: first \:term \: and$

$common \: difference \: of \: an \: A.P.$

$then \: n^{th} \: term \: of \: A.P = a_{n}$

$a_{n} = a + (n-1)d$

$Here , a+(n-1)d = a + 15d \: (given)$

$\implies n-1 = 15$

$\implies n = 15+1$

$\implies n = 16$

Therefore.,

$\red{ Value \:of \: n} \green { = 16 }$

•••♪