2) Find 42 for the A.P 12,9,6
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Answer:
A42 =143
Step-by-step explanation:
the formula is An=A1 +(n-1)d
we have to find A42
given A1 =12
n= 42
d =12-9= 3
=9-6 =3
hence, d =3
substitute,
An=A1 +(n-1)d
A42 = 12 + (42-1)3
=12+41*3
= 12+123
A42 =143
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