Question

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find the 20th term from the last of the A.P : 3,8,13,......,253.



✓ full explanation required

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Answer 1

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find the 20th term from the last of the A.P : 3,8,13,......,253.??

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SOLUTION:-

a=3,d=5

253=3+5(n−1)

Or, 5(n−1)=250

Or, n−1=50

Or, n=51

So, the 20th term from the last term =51−19=32nd term

Now, n

32

=3+5×31=158

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Answer 2

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158

Step-by-step explanation:

Given:-

3,8,13.......,253

To Find:-.

20th term form the last term we consider the sequence as follows

Solution:-

a = 253 and d = 3 - 8 = -5

an = a + (n - 1)d

a20 = a + (20 - 1)d

= 253 + 19 × (-5)

= 253 - 95

= 158

Hence, the 20th term from the last term is 158.

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