Math, asked by chandgarwekrj1981, 4 months ago

2) Find 42 for the A.P 12,9,6​

Answers

Answered by hamraj2005
1

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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