Question

Please answer my question

Answer 1

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Answer 2

Step-by-step explanation:

Given series is 3, 8, 13, ...... 253.

Here, first term , a = 3

common difference , d = 5

Let us find total number of terms at first.

use

=> 253 = 3 + (n - 1)5

=> 250 = 5(n - 1)

=> n - 1 = 50

=> n = 51

So, there are 51 terms in given series.

Now we know, mth term from last =last term - mth term + 1.

So, 20th term from last = 51 - 20 + 1 = 32

Hence, 20th from last = 32nd term from first.

use ,

= 3 + 31 × 5 = 3 + 155 = 158

THEREFORE, THE 20TH TERM FROM THE LAST TERM IS 158.

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