The ratio of the fifth and sixth terms of the sequence 1,

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The ratio of the fifth and sixth terms of the sequence 1, 3, 6, 10, ...... is

1. 5 : 6
2. 5 : 7
3. 7 : 5
4. 6 : 5

Correct Option: B

The pattern of the sequence is :
First term = 1
Second term = 1 + 2 = 3
Third term = 3 + 3 = 6
Fourth term = 6 + 4 = 10
Fifth term = 10 + 5 = 15
Sixth term = 15 + 6 = 21
∴ Required ratio = fifth term : sixth term
∴ Required ratio = 15 : 21 = 5 : 7