How many terms should be added to obtain a sum of 10877 in the arithmetic series 5, 9, 13,.......?
A71
B73
C63
D74
Answer:
B. 73
Read Explanation:
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
