Question

which term of the AP 3,8,13,18......78​

Answer 1

Answer:

a=3 ,common difference (d) =5 an=78

Explanation:

using formula : an = a+(n-1)d

put the values: 78=3+(n-1)5

78-3= (n-1)5

75/5=n-1

15 = n-1

n=16 (ans.)

hope it will help you

Answer 2

Answer:-

$\small\sf{a=3}$

$\small\sf{d=8-3=5}$

━━━━━━━━━━━━━━━

$\small\sf{Let\:nth\:term\:of\:the\:AP\:is\78}$

$\small\sf{Therefore,an=78}$

$\small\sf{a+(n-1)d=78}$

$\small\sf{3+(n-1)5=78}$

$\small\sf{(n-1)(5)=75}$

$\small\sf{n-1=15}$

$\small\sf{n=16}$

Hence, 16th term of the AP i.e., is 3,8,13,18,....is 78.