Question

How many terms should be added to obtain a sum of 10877 in the arithmetic series 5, 9, 13,.......?

• A. 71
• B. 73
• C. 63
• D. 74

Answer 1

Answer:

B. 73

Finding answer from options are more easier Sum of AP= n/2(2a + (n-1)d ) = 73/3 ( 2 x 5 + (73 -1 ) x 4) = 73/2( 10 + 72 x 4) = 73(5 + 72 x 2) = 73(149) = 10877