Which term of the arithmetic progression 58,56,54,.......is 22
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a = 58
d = -2
an = 22
an = a + ( n - 1 ) × d
22 = 58+(-2n+2)
22 = 60 - 2n
22-60 = -2n
-38 / -2 = n
19 = n
minus will cancel
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