A) 50 575
B) 50 560
C) 50 500
D) 50 505
Correct Answer: C
Solution :
Even natural numbers which are divisible by 5 are 10, 20, 30, 40, ... They form an AP with a = 10, d = 10 \[{{S}_{100}}=\frac{100}{2}[2\times 10+(100-1)\times 10]\] \[=50\,(20+990)\] \[=50\,(1020)=50\,500\]
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