Question

The sum of 3 numbers in AP is 30 If the greatest number is 13 then it's common difference is

Answer 1

Answer:

Step-by-step explanation:

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Answer 2

The common difference is 3.

Step-by-step explanation:

Given : The sum of 3 numbers in AP is 30 If the greatest number is 13.

To find : It's common difference ?

Solution :

Let the three numbers of the A.P. be 'a-d, a, a+d'

The sum of 3 numbers in AP is 30.

i.e. $a-d+a+a+d=30$

$3a=30$

$a=\frac{30}{3}$

$a=10$

The greatest number is 13.

i.e. $a+d=13$

$10+d=13$

$d=13-10$

$d=3$

Therefore, the common difference is 3.

#Learn more

The sum of 3 number in AP is 30 and the ratio of first number to the 3rd number is 3:7.find the number​

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