Question

*21, 18, 15, …………. या अंकगणितीय श्रेढी चे कितवे पद शून्य आहे?*

1️⃣ 8 वे
2️⃣ 6 वे
3️⃣ 9 वे
4️⃣ 7 वे​

Answer 1

SOLUTION

TO CHOOSE THE CORRECT OPTION

Which term of the below arithmetic progression is zero 21, 18, 15,

1. 8 th term

2. 6 th term

3. 9 th term

4. 7 th term

EVALUATION

Here the given Arithmetic progression is

21, 18, 15,

First term = a = 21

Common Difference = d = 18 - 21 = - 3

Let n th term is zero

So by the given condition

$\sf{a + (n - 1)d = 0}$

$\sf{ \implies \: 21 - 3 (n - 1) = 0}$

$\sf{ \implies \: - 3 (n - 1) = - 21}$

$\sf{ \implies \: (n - 1) = 7}$

$\sf{ \implies \: n = 8}$

So 8 th term is zero

FINAL ANSWER

Hence the correct option is

1. 8 th term

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