15. Determine the number of terms in the A.P. 3,7, 11, ..., 407.
Also, find its 20th term from the end.
(a) 102, 331
(b) 101, 330
(c) 100, 331
(d) 100, 399
Answers
Answered by
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Step-by-step explanation:
Use formula an=a+(n-1)d
We get no. Of terms is 102
And 20th term form the end is 331
Answered by
0
Answer:
(b) is correct.
If it helps mark me as brainliest.
Step-by-step explanation:
Here, a = 3, d=4 and nth term= 407
nth term= a+(n-1)d
=> 407= 3+(n-1)4
=> n= 102
There are 102 terms.
From the last,
a=407, d=-4 and n=20
nth term= a+(n-1)d
= 407+19(-4)
=407-76
=331
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