Question

7th term of an arithmetic sequence is 17 and it's 17th term is 7a) what is its common differenceb) find 24th term c) what is the sum of first 47 terms? d) what is the sum of first 48 terms​

Answer 1

Answer:

Because 7th term is 17 the AP starts from 11 with common difference of 1(ANSWER a)

Step-by-step explanation:

So to find 24th term is

10+24

=34 (ANSWER b)

for sum of 47 terms

=(sum of AP 1 to 57)-(sum of AP 1to 10)

=[57*(57+1)/2]-[10*(10+1)/2]

=[57*58/2]-[5*11]

=(57*29)-55

=1653-55

=1598(ANSWER c)

for 48 terms

sum

=[58*(58+1)/2]-(5*11)

=(59*29)-55

=3422-55

=3367 ANSWER