Teaching BPSC बिहार माध्यमिक TGT (9 to 10) शिक्षक भर्ती 4.0 Mock Test Mathematics Sequences and Series Arithmetic Progressions
The ratio of the 11th term to the 18th term of an A.P. is 2 : 3. Then the ratio of the sum of the first five terms to the sum of the first 21 terms is
1
3 : 25
2
4 : 35
3
5 : 49
4
More than one of the above
5
None of the above