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ICSE Class 10 Answered

1 2 3 4 5 6 7 8 9 10 Write the first and last number of the tenth line
Asked by namradalachu4 | 25 Jun, 2019, 05:49: AM
answered-by-expert Expert Answer
The first numbers follow a sequence
1,  1+1=2,   2+2=4,    4+3=7,    7+4=11,    11+5=16,    16+6=22, ...... and so on
It can also written as
1 cross times 1 plus 0 2 cross times 1 plus 0 3 cross times 1 plus 1 4 cross times 1 plus 3 5 cross times 1 plus 6 6 cross times 1 plus 10 7 cross times 1 plus 15 8 cross times 1 plus 21 9 cross times 1 plus 28 10 cross times 1 plus 36 space equals space 46
So, the first number on the tenth line will be 46 and the last number will be 55.
Answered by Renu Varma | 25 Jun, 2019, 11:47: AM

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