the sum of first 7 terms and 15 terms of an A. p are 98 and 390 respectively, then find the sum of first 10 terms
Answers
Answered by
6
s7 = 98
s15=390
s7= 7/2(2a+6d)
s15=15/2(2a+14)
now solve both by elimination method
s15=390
s7= 7/2(2a+6d)
s15=15/2(2a+14)
now solve both by elimination method
mdnasir71835ox6kdv:
u r write
Similar questions
English,
6 months ago
Computer Science,
6 months ago
Math,
1 year ago
Math,
1 year ago
Hindi,
1 year ago