. Find the 20th term from the last term of the A.P. 3, 8, 13, ....,253
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Answered by
2
Answer:
158
Step-by-step explanation:
Solution: a = 3, d = 5
Now, 253 = a + (n + 1) d
⇒ 253 = 3 + (n -1) x 5
⇒ 253 = 3 + 5n – 5 = – 2
⇒ 5n = 253 + 2 = 255
⇒ n = 255/5 = 51
Therefore, 20th term from the last term = 51 – 19
= 32 a32
= a + 31d
= 3 + 31 x 5
= 3 + 155
= 158 Thus, required term is 158
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Answer:
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