Question

Find the first number of the series : ____, 5, 10, 15, 20, 25​

Answer 1

Answer:

0,5,10,15,20,25

Step-by-step explanation:

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Answer 2

Answer:

Required first term is 0.

Step-by-step explanation:

Given series is 5,10,15,20,25.

Common difference of the terms of this series is 5.

So we can say that this is a AP series.

Here number of terms are 6.

Let first term of this series be x.

We know in A.P series,

$a_n = a+(n-1)d$

Where n is the number of terms.

$a_6 = x+(6-1) \times 5$

$25 = x+(6-1) \times 5$

$x + 25 = 25$

$x = 25 - 25 = 0$

Required first term is 0.