Question

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Answer 1

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→Find the value of n in a.p. 4,7,10...... 82

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⇒Given:

• a = 4
• $a_n=82$

⇒To Find:

• Value of n

⇒Solution:

⇒Common Difference = 7 - 4 = 3

Now implying the formula:-

⇒$82=4+(n-1)\times 3$

⇒$78=(n-1)\times 3$

⇒$n-1=\frac{78}{3}$

⇒$n-1=26$

⇒$\huge{\pink{\overbrace{\underbrace{n=27}}}}$

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Formulas Used :-

• $a_n=a+(n-1)d$

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