Question

write an arithmetic sequence
a) write the fist term
b)write the common difference
c)compute the nth term
d)compute the 25th term of the sequence
e)compute the sum of the first 15 terms of the sequence

Answer 1

Answer:

Arithmetic sequence 1,2,3,4..........n terms

a) first term(a)= 1

b) common difference(d) = 2-1= 1

c) nth term= a+(n-1)d

1+(n-1)1= n

d) 25th term= 1+ (25-1)1 = 25

e) sum of 15 terms= n/2 [2a + (n-1)d]

=15/2 [2 + 14]

=15/2 × 16

=15×8= 120

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