JEE Main 2019 Mathematics question
Let be an A.P., and . If and S − 2T = 75, then is equal to:
Answer: (C)
Solution
S − 2T = 15d = 75 ⇒ d = 5; a = 7; .
Let be an A.P., and . If and S − 2T = 75, then is equal to:
S − 2T = 15d = 75 ⇒ d = 5; a = 7; .