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This is arithmetic progression with common difference of minus three...
Formula:

First Term +[ (number of term you want-1)*(common difference which is negative 3)]

Example

For the 3RD term: -5

=1+[(3-1)*(-3)]
=1+[-6]
= -5

For 5TH term: -11
=1+[(5-1)*(-3)]
=1+(-12)
=-11

.: For the 21st term:
=1+[(21-1)*(-3)]
=1+[-60]
= -59
:D

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