Question

10. In an AP, if S6 = 72, then find the arithmetic mean between the first term and the
last term.​

Answer 1

Answer:PLEASE MARK ME AS A BRAINLIST

Step-by-step explanation:

YOUR ANSWER IS 12

Answer 2

$\huge{\underline{\underline{\red{\mathfrak{Answer :}}}}}$

$\tt Given \begin{cases} \sf{S_{6} = 72} \\ \end{cases}$

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To Find :

We have to find arithmetic mean

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Solution :

We know the formula of Sn

$\Large{\star{\underline{\boxed{\sf{S_{n} = \frac{n}{2}(a + l)}}}}}$

(Putting Values)

72 = 6 (a + l) /2

72 = 3 (a + l)

72/3 = a + l

a + l = 24 ......... (1)

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Note :- When we have to find the arthmetic mean between first and the last term then it is in the form of (a + l)/2

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So, From equation 1.

a + l = 12 * 2

(a + l)/2 = 12

Hence, Arthmetic mean between the first and the last term is 12.

$\rule{200}{2}$

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