find the sum of first 25 terms of the AP 7,13,19,... using formula
Attachments:
Answers
Answered by
2
Answer:
2175
Step-by-step explanation:
formula is n/2(2a+(n-1)d))
n is number of terms
a is first term
d is common difference a2-a1
n= 25 a= 7 d =6
substitute in given formula
25/2[2(7)+(25-1)6]
25/2[14+144]
25/2[158]
25 × 79
calculate it and find answer
hope it helps you
mark me brainliest if you like my explanation
Similar questions