Question

please can any one helpp.....with proof

Answer 1

Dear Student:

Question.1

Composite Number:A composite number is  positive number which is not  prime.

The first  seven composite number:4,6,8,9,10,12,14.

Arithmetic mean of first seven composite number is

The sum of n terms.

 $S_{n} =\frac{a_{1}+a_{n}}{2}$

$a_{1}= 4,a_{n}=14$

$S_{n}=\frac{7*(4+14)}{2}$

$S_{n}=63$

Hope it helps

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