Question

18.Which term of AP: 3,6,9 ..... is 78 ?​

Answer 1

Answer:

An=78, A=3, D=3 and N is to be found...

N=26

Step-by-step explanation:

An=A+(N-1)*D

78=3+(N-1)*3. (using above values)

78=3+3N-3

78=3N

N=26

Answer 2

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✰GIVEN

AP:3,6,9,..................

✰TO FIND

78th Term

✰SOLUTION

➡A=3

➡D=6-3=3

➡An=78

Using the formula,

an=a+(n-1)d

putting the given values

⇥78=3+(n-2)3

⇥78-3=(n-1)3

⇥75=(n-1)3

⇥$\frac{75}{3} = n - 1$

⇥25=(n-1)

⇥25-1=n

⇥24=n

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