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If s1 = (1), s2 = (2) (3) s(3) = (4), ...

If `s_1 = (1), s_2 = (2) (3)`
`s_(3) = (4), (5), (6)`
`s_4 = (7), (8), (9), (10)`,
`s_5 = (11),(12),(13),(14),(15)`….etc.
Where `s_1 , s_2, s_3…..`, etc are the first, second and third terms of the given given sequence.
The last digit and tens digit of the sum of all the elements of the first +21 terms of this sequence respectively are :

A

7,0

B

6,9

C

9,6

D

none of (a),(b),(c )

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The correct Answer is:
B
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