A) 5
B) 20
C) 25
D) 10
Correct Answer: B
Solution :
[b] \[S\text{ }=\text{ }3+4+8+9+13+14+18+\,...40\]terms. \[=7+17+27+\text{ }...\text{ }20\]terms \[=\frac{20}{2}\{2\times 7+(20-1).10\}\] \[=\,2040\] \[(102)m=2040\] \[\therefore \,\,\,m=20\]You need to login to perform this action.
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