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Find the 12th term from the last term of the A.P -2, -4, -6,… -100.

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The given A.P is -2, -4, -6, … -100 

d = -4 – (-2) = -4 + 2 = – 2 

Finding the 12 term from the last term 

a = -100, d = 2 (taking from the last term) 

n = 12

tn = a + (n – 1)d 

t12 = – 100 + 11 (2) 

= -100 + 22 = -78 

∴ The 12th term of the A.P from the last term is – 78

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