Question

Find the number of terms in A.P:
3, 15, 27,39,....639​

Answer 1

Answer:

54 terms in all

Step-by-step explanation:

see the attachment

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Answer 2

a=3, d =15 -3=12 n= 54 a 54 = a+( n-1) d =3 + (54 -1) × 12 = 3+ 53×12=639 term which is 132 more than its 54 th term is-639 +132=771 an= 771 771 = a+(n-1) d 771= 3+(n-1) 12 771 = 3+(n-1)12 64 =n-1{n=65}