Question

find 12th term of AP is 56, 54, 52 ......

Answer 1

a=56
d=54-56=-2
T12= a+(n-1)d
=56+(12-1)×(-2)
=56 -22
=34 Ans

Answer 2

we have to find the 12 term

formula

a(n) = a+ (n-1) d

a is first term
d is difference
n is number of term

here n= 12
a=56
d= 56-54= 2

a12 = 56 +(12-1)2
a12 = 56 + 11*2
a12= 56+22
a12= 78

so 12th term is 78