if the nth term of an A.P is 7n-5. Find 100th term

The nth term is given by

Putting the value of n = 100, we get

You can verify the answer by the following method:

Substitute n = 1, 2, 3 and so on, and thus, calculate the first, second, third terms. Now, calculate the common difference by subtracting the first term from the second term.

Now, calculate the 100th term by using the formula

Hope this helps you.

Cheers!

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given that the n th term of the A.P. is 7n-5

so 100 th term will be 7 (100) +5

                                       =705

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695

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I have got a doubt. Don't we have to use any formula?

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I have got a doubt. Don't we have to use any formula?

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