Question

Which term of the a.p. 21,42,63,44-------------is420

Answer 1

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→Which term of a.p.

21,42,63,84----------------is420?

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⇒Given:

• a = 21
• $a_n=420$

⇒To Find:

• n=?

Common Difference = $a_2-a$

⇒42-21

⇒$\blue{d=21}$

According to question:-

$420 = 21+(n-1)\times 21$

⇒$399=(n-1)\times 21$

⇒$n-1=\frac{399}{21}$

⇒$n-1=19$

⇒$\huge{\pink{\overbrace{\underbrace{n=19}}}}$

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Formulas Used :-

• $\large{a_n=a+(n-1)d}$

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Answer 2

Step-by-step explanation:

19 us the answer is yes...